[Sony Xperia 1 III] Dr. Claw:
I use the app "iSyncr" on all of my Android devices with mostly no issue (provided I downgrade to an earlier version than the current).

Only I have noticed some behavior that is common only to the Xperia 1 (2019) and Xperia 1 III (2021) models. After installing this app for the first time on these devices from a factory reset, it works exactly as I expect. However, if I power the devices off, the next time I turn the device on and try to run this app, it will crash as soon as I go to the "Wifi Sync" and the Wifi Sync service starts. No matter how many times or which version of this app I use, this will happen under these conditions.

Here's what I've tried thus far:

Factory reset (the app works until you shut the power off. If you restart, it will continue to work until you shut the power off and cold boot)

Uninstall and reinstall, even deleting manually any left over app directories on the MicroSD card or internal storage. The behavior persists.

Use different versions of the software (either latest from Play Store, an earlier version that I use because Storage Access Framework is garbage with files). The same thing will happen.

Uninstalled/Reinstalled Chrome and Android System Webview. No effect.

This all may point to a "software versus hardware" issue (and I've reached out to the "developer" -- the original helpful developer sold their apps to scammers not to long ago; we'll see how this works), but I think the issue is specific to Xperias of a certain age. The XZ2 Compact I have (running Android 10) does not have this issue. No other Android device (regardless of software version) has this issue but these 2 Xperia 1s. It only seems to surface after a cold boot (reboot after shutting the power off, rather than restart). The strangest part of this issue is that the X1 (2019) is running Android 11, and the X1 III (2021) is running Android 12.

The only clue I have to what is going on is this from the app log (relevant parts bolded):

Oct 22, 2022 3:55:56 PM: SYNC JOB: Creating sync service

Oct 22, 2022 3:55:56 PM: Rename /storage/emulated/0/syncr/files.xml.tmp to /storage/emulated/0/syncr/files.xml

Oct 22, 2022 3:55:56 PM: Oct 22, 2022 3:55:56 PMndError: Class not found using the boot class loader; no stack trace available

In a working session, this is what you normally see:

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: IAP: Billing setup

Oct 22, 2022 1:12:03 PM: IAP: Got IAP Results

Oct 22, 2022 1:12:03 PM: IAP: User IAP purchase = unlimited_for_old

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: IAP: IAB Purchase Refreshed: 0

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Updating files

Oct 22, 2022 1:12:03 PM: Spending Time To Update File Paths = 7

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Don't use document tree for = /storage/emulated/0/syncr/files.xml.tmp

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: -------- installing license. Force? true

Oct 22, 2022 1:12:03 PM: -------- sd card and internal memory

Oct 22, 2022 1:12:03 PM: Rename /storage/emulated/0/syncr/files.xml.tmp to /storage/emulated/0/syncr/files.xml

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Updated File

Oct 22, 2022 1:12:03 PM: Don't use document tree for = /storage/emulated/0/syncr/license

Oct 22, 2022 1:12:03 PM: Don't use document tree for = /storage/emulated/0/syncr/mlicense

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:03 PM: Don't use document tree for = /storage/C088-1F08/syncr/license

Oct 22, 2022 1:12:03 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:03 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:04 PM: use lollipop sdcard = false

Oct 22, 2022 1:12:04 PM: Don't use document tree for = /storage/C088-1F08/syncr/mlicense

Oct 22, 2022 1:12:04 PM: -------- installing license. Force? true

Oct 22, 2022 1:12:04 PM: -------- sd card and internal memory

Oct 22, 2022 1:12:04 PM: SYNC JOB: Creating sync service

Oct 22, 2022 1:12:04 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:04 PM: Destroying iSyncr Sync Service

Oct 22, 2022 1:12:04 PM: Sync Service, stopped in the foreground

Oct 22, 2022 1:12:04 PM: Sync Service, started in the foreground

Oct 22, 2022 1:12:04 PM: Sync Service, stopped in the foreground

Is there some sort of routine on Sony software that removes things after you shut the phone down and restart? This is the only explanation that I can muster for this behavior for one app out of 70 on my phone. Is there a way to get more information or see which services can be called? This is a Wi-Fi dependent service, but there is no issue with Wi-Fi that I can detect on either device (a 5GHz SSID is being used on both).