[One (M8) Q&A, Help & Troubleshooting] cucolino:
So, this one I put in General section on purpose, rather than the Troubleshooting and Q&A section, cause main purpose is to disguise about the bugs and things that are simply wrong.... Mainly probably Android issues rather than HTC, but their team has big impact on those...

I'm gonna start by the fact that I got the M8 just a couple days ago, and it's an upgrade from my previous M7 (Stock 4.3, TWRP Unlocked & rooted).

The first thing that I did after turning it on was, Wifi -> Software updates -> and got 3 OTAs in a row, to get me to 5.0.1... After that, I started to "migrate" the phone; Loging in G-acc, downloading apps from PlayStore.. and bump, here's the issue number 1:

- PlayStore keeps saying "Connection lost. Retry" or giving an error 923 on downloading apps, like every few minutes or so. This only happens when using 3G or 4G connection. Writing reviews is impossible, cause at the time I actually write something, and press Apply, the message is lost, and "Try again" notification appears instead... Never happened before on M7, so I checked with my carrier and we've done all the testing - It's for sure something with the phone, not the signal. carrier or tower-switching....

Next thing was, youtube has the same issues: Every few minutes (even less), a "Retry" button appears, and has to be pressed 2 or 3 times to load search results, videos, etc... Never breaks the connection during video play though. But, still, playing playlist is impossible, due to error being in between every video change...

Issue number 3: Gallery keeps getting everything that's on the phone. This includes Messenger (Facebook) app's emoticons, which are shown one-by-one in it's own albums, resulting in having over hundred albums in a gallery, - I know this can be hidden, but hiding over 100 folders is not that easy either...). I checked data on my M7 - same folders, same files of messenger, but Gallery never showed them at all.

It also shows all of the pictures I've ever shared with a particular person, since Messenger downloads those pictures in a folder... What have they done with the Gallery app?!? Is there anyway to downgrade to some older version...?

Issue number 4: Cloud gallery notification pops-up every single time the Gallery is opened. Even though I hit "No thanks" button, the next time the app is opened, notification saying "Gallery just got better with cloud service" pops-up. Any way of disabling this notification?!??? I guess that mentioning the uselessness of Zoe app due to not having Save button is irrelevant, right...? This Cloud things seems to mess up the heads of the HTC Dev team, ha?

Issue number 5: Power saver notification can't be hidden from the Lock screen; My life with M7 was 90% of the time with "Power saver" option turned on (All except for the data cut-off option selected). I always had the notification in the upper bar of the screen, but never on the Lock screen itself, in the middle of the screen. Now, on M8 this is visible. Along with the big "X" symbol that turns it off. I swear I've gone through all of the settings, but nowhere found any option to hide it.

Issue number 6: Google drive downloads low-res videos instead of originals! So, I keep a lot of my FullHD (1080p@50fps) of the GoPro on my Drive. Now, when I wanted to see those videos on my phone, I hit the Download button, and look what I got: 720p (1280x720) videos @ 25fps. Converted MP4 files. Without any notification, any option set, nothing... And I've downloaded the same files on M7 non-converted, so that I could edit them and upload them on social networks etc... Why is this the case, and why is this behaviour nowhere even documented? At least I haven't found it...?

Resolved issues:

- SD Card write error; It's a pain in the ass what they did. More than that, its the pain in the ass that in 5.0.1. where this was repaired (via Documents app approval), the app crashed when selecting SD card -> due to the card not having any name set (after format). It would be nice if this was documented somewhere too...

- Whole device freezes for around 10 secs whenever message is sent in Facebook Messenger app: This is resolved by turning off "In-App sounds" option in the app's settings. Still have no idea why this would happen, and why only on M8, (Nexus 5 and 6 don't have these issues running same system and app version...), so can't say who to blame, but at least it can be bypassed...

Facts (rather than issues): About M8 itself... Well, the camera is far from what they promised, and the battery is nowhere near the capacity they claim it to be. While the screen is pretty much the same as it was on the M7, I'm really starting to wonder what is the big change in the model at all (apart from louder speakers, very dumb headphones jack reposition, and gladly SD card support back in game...).

Now for the worst of it all: The playstore review content; HTC Development team seems to simply delete all reviews that are not saying what they'd like to hear. Either 1 star, 2 star, and comments that points to some issues - the review gets deleted within couple hours. I've been mentioning bugs on 3 apps, like 4 times so far, and all my reviews were gone... While they are kept on many other apps. I mean, is this the way to treat customers?!?

What are your thoughts? What are the bugs you found and I haven't yet...? I really want to know as much as I can, because I'm starting to regret for my choice....