Don't remember ever having this problem before about a month ago. Could coincide with the new version and maybe its optimizations are an issue. No idea, but have been looking at the debug log. Don't see anything at a glance that indicates a failure of any kind. See lots of subject lines floating by, but these messages never end up in the synchronized folders and Tasker events never fire. There was something about "*** Sync state NOT reset ***".
The thing seemed okay for a day or two. Then noticed it was bogged down with a red exclamation. Have seen it say "Network Error" once or twice, but there are no network problems as other apps are connected the whole time. GMail continues to update the shade while AquaMail sits there complaining of sync errors. Have started up streaming videos, music, etc. without issues while AquaMail fails to deliver messages. Network connection is Fiber and WiFi is not an issue.
Uninstalled. reinstalled. tried stock settings, *many* other settings combinations, verified I'm nowhere near out of space. Changed to the IMAP option (as opposed to the GMail/Google Apps option). Didn't set it up manually, but can't imagine I would use different settings. Have several other IMAP clients running here and none of them just dry up like this. I can't even remember a brief outage with any of them, including those running on the HTC One devices in question.
It's pretty much unusable at this point. It will sputter and get a few messages and then comes the dreaded red exclamation mark. After that it rarely does anything until I reinstall it. Then it might get 15 minutes more.
Turned off the Network settings for "buggy" devices. Turned on debug. It's just generating a huge log file, which includes many message subjects, but never gets any new messages.
I really can't understand how a basic IMAP client could fail like this. Google, OAuth, etc. I could see (though don't recall any other apps having problems). But IMAP?! Something is horribly wrong here. Where do I send the log file?
Edited to note that I sent the log file. It should have some errors followed by an inexplicable string of successes. Ever since I sent this, it's decided to start working again. Would be great if that stuck, but I doubt it, unless due to the latest tweaks to the settings.
Thanks!
PS. I glanced again and see several cases of "Read Timeout", followed by "Aborting the Connection". When those stopped happening, all was well again. Can't imagine how it is timing out on GMail, but I know there are various ways to connect to them (e.g. different servers, ports, etc.) Can I set this timeout somewhere as I'd just as soon it wait longer than give up for the next n minutes.