That wouldn't really surprise me. Off the top of my head things I've experienced in the past week or two and remembered:

- Four involving a Vim upgrade being pushed by one tool and blocked by another; a broken shortcut causing gVim to load with an error message and no working menus - not fixed by uninstall/reinstall; unable to delete one of the Vim DLLs; Windows Explorer window lockup after right click (possibly it had the DLL loaded for Vim context menu icon?).

- FireFox regularly stops loading pages until I visit Help -> About FireFox and see that it's silently done an upgrade and is waiting to restart.

- Cloud service with SSO login working for months, stopped working with mysterious 'error processing your credentials' type message.

- and it has a broken 'send password reset email' feature, no email gets to me.

- checking for blocked emails in SaaS email filter, when I put my email in the 'Recipient' box of the search, Edge browser autofill puts my email address in the 'Sender' search field as well, incorrectly / uselessly.

- Edge browser autofill dropdowns routinely cover SaaS product's HTML/JS dropdown menus.

- New SaaS product which has a username/password login instead of SSO, but login goes to a prompt with only 'use SSO' (which we don't) or 'forgot my password' (after logging in successfully). Clicking 'use SSO' gets past that screen, I think it's internal between-different sub-sites SSO abstraction leaking to the customer.

- SaaS product offers 2-factor auth using Google Authenticator, if using the signup key instead of QR code it appears in a difficult-to-select text label. Entering an expired TOTP code shows an incorrect error saying the code can only be used once (Time Based OTP codes are valid for the time duration, often ~30 seconds for any number of uses).

- Saving details for that site in a SaaS password vault from a different vendor, an error like 'no saved password' popped up despite having a password saved.

- At least four different debugger errors - set breakpoint either not setting, or not breaking, or debugger crashing, or code crashing without error message until upgrading the runtime.

- Windows 'restart and update' over and over until 'check for updates' and it decided there weren't any, then the option disappeared.

- Dell laptop firmware upgrade which rebooted to upgrade firmwares, then said it failed.

- Always on VPN for work which stops passing traffic until the service is restarted, a couple of times a month.

- Backup software which runs for a week then fails, until rebooted. Vendor support blames the network.

- Monitoring software which reported the wrong datastore sizes from a VMware host until the host management services were restarted, one or both of them are bugged.

- Theater website's date range selection on mobile, I dropped down the start, slowly worked through year/month and tapped a day, dropped down end, again went through year/month and tapped a day after the start, 'apply' button was greyed out, tapped outside the calendar controls, and they hadn't registered the days. Retried and it worked second time.

- Multiple websites where the infinite scroll or 'load more' links stop working, including big ones like YouTube.

- SaaS product search finding an item for one coworker, not finding it for another coworker.

- SaaS ticketing system not finding the ticket ID typed into the search until the search is retried a couple of times, multiple times per day.

- SaaS ticketing system not handling session timeout properly and presenting a normal interface where everything looks fine until attempting to interact with it and then presenting an 'oops something went wrong' style error message instead of going to the login prompt.

- Switching back to VMware web client in a browser tab, finding it showing the "your session will expire in 20 seconds" countdown box, knowing that the session expired an hour or three ago, and the 'extend session' button doesn't work.

- SaaS password vault, VMware web client, not handling session timeout properly and presenting a normal interface where everything looks fine until attempting to interact with it and only then whisking away to the logon prompt.

- Secure Jumpbox tool doesn't save its settings between sessions, even though it explicitly has a 'make this the the default value' type option.

- Secure jumpbox tool presents multiple screen resolution options which don't work, only some of them work.

- Database engine sync reporting different sync status in different views.

- Reddit discussion from 1 year ago with URL to the CDC website which is now a 404.

- iOS keyboard unreliable at opening the select-all/copy/paste popup dialog, often needs prompting and reprompting.

- iOS keyboard unreliable at starting swiping.

- After powering off phone and on again, torch GUI would switch 'on' but torch LED was not lit up, persisted for maybe 10 seconds after unlocking, as if there were internals still booting and the GUI was disconnected from control of the hardware.

- pfSense (OpenBSD-based) firewall upgrade process from old versions is broken.

- Computer game where the character turned invisible and then never turned visible again; glitchy bounds checks; glitch-teleported back to a starting point in the middle of a fight; unreliable animation on characters being enchanted; glitchy behaviour happening for an attack which doesn't have that behaviour. 'Disable background service' setting doesn't disable the background service. Network glitched and dropped back to the main menu not counting any of the progress made. Showed loading screen then didn't load. Network glitch and the fire button became the wrong way round - gun stopped firing when clicked, fired continuously when not clicked. Audio stopped working after RDP connection until game restarted.

- Proprietary software content to fill the disk with logfiles that aren't tidied up or limited by default.

- Search engines which don't search for what I type in and show something else instead. Try Google for "spirtling", top result is a Wiktionary page for it as an archaic spelling of using a Scottish porridge stirrer, other relevant results. DuckDuckGo result has changed it to "sporting" and are horse racing tips, then spirling and spiraling, then spirtling.

- New York Times' Connections game, on small screen phone the "one away" message appears in the wrong Z-order behind the top bar, unreadable unless tapped on to bring it to the front. After a game the 'register an account to track progress' popup partially blocks the 'close summary screen and look at the final game state' X button.

- Runaway memory use in Amazon.co.uk and YouTube.com tabs left open too long until FireFox restarted that 'about:processes' can't help with.

- Teams continuing ringing on cellphone after I've answered the call on laptop.

- Google StreetView glitches where it sometimes gets stuck at junctions and can't move forwards but can double-click-jump there instead.

- and if we count glitchy / unexpected / poor user interface or user experience as well.. Python's IDLE laggy keyboard input until latest version installed. Vendor renewal email which doesn't say what is being renewed in a useful way. Etsy online shop which encouraged me to click on 'related' links then gave me a captcha because they couldn't tell if I was human or robot. Inconsistent YouTube keyboard shortcuts. AWS's chat LLM gave incorrect instructions for how to achieve firewall rule change on AWS server. VoIP phone app which switches back to the signing-in animation every few minutes.

- The https://www.skyscanner.net/ date selection is poor (it's not clear that clicking 'Depart' also sets the 'Return' date until you try and get rid of the calendar so you can set the return date and find you cannot. You can (X) to clear the return date and the depart date stays configured so you can set a new return date, but you can't X out of the depart date to set a different one without clearing the return date as well and having to reset that. Once both dates are set, you can't adjust them; clicking the 'Return' box where the UX looks like you're setting a return date, when you click on a day it will clear both dates and then set the date you click on as the new departure date, getting in the way. The depart and return boxes have the same visual loko as the From/To boxes which you can type airport codes in, but this is misleading as you cannot type a date into the date boxes.

- https://calculator-online.net/sohcahtoa-calculator/ says "This calculator uses the SOH.CAH.TOA mnemonic method to solve the sides and angles of a right triangle. It provides step-by-step calculations using the SOHCAHTOA formula" but put in leg a=1 and sin ⍺=30 and it calculates that the hypotenuse is length 2, showing the step-by-step solution using Pythagoras' Theorem using the length of sides b and c that we haven't given and don't know.

And this isn't counting design I find confusing, documentation which is unclear, layout bugs where things don't visually align or the spacing is misleading or the organization is unhelpful, bugs in tabstop ordering, or not-really-bugs like Notepad++ lagged with a single line of 10MB of data, or EMACS lagged with a long line, etc.