I bought a m3s for my wife who hates change. Probably wasn't a smart move on my part. Bigger and different from anything she's had in the past. But she loves it after only using it since christmas. Unfortunately it has a few very annoying glitches - which as far as i can tell don't appear to be Flyme issues, because no one else (in flyme world) is having them.

#1 Contacts sync hangs for huge periods of time. (Then randomly succeeds). - this seems to be a common occurrence over the last few years across all android devices. the general advice seems to be 'fix your contacts.' however non of the fixes seem to work.  I would be fine with non syncing, except that it locks up everything else i.e. no new emails/calendar events.  

#2 Youtube Login - more of a gripe than an issue, although could be related to #3. When opening the youtube app, and attempting to login, it has correctly detected the google account, but states that the network is unreachable and to try again later. tapping the "+" button to add new account, then going back, magically logs in as the user that was in the list to begin with. 

#3 Youtube network connectivity issues. - At random points in time (have not been able to reproduce reliably yet) the youtube app will cease working stating network connectivity problems, try again later. I have found that clearing app cache & data resolves this but.... GOTO #2 

So last night i took the device and performed hard reset from recovery. Turn it on, and was very surprised to see personal data (photos) still there. (Did it really reset??) Youtube Issues #2 still exists, but the contact sync seems resolved (for now) will wait and see if #1 or #3 return.