Using Outlook for Android in business environments for email and scheduling
Yep exact same issue here. Calendar unsyncs. I eventually notice that my calendar widget is blank. Go back in to Outlook email app, resync calendar, fixed. Then a few hours later, gone again.
It's definitely sporadic. Sometimes it will be OK for 2-3 days. Sometimes it disappears 2-3 times in the same day.
Really annoying.