Sorry to hear that. We haven't been able to nail this one down yet. This is on Android I presume? The next build coming out will have crash reporting which won't fix the issue, but I'm hoping it will give us the information we need to find the fix.
The new public release just dropped and I _think_ we have fixed all the outstanding bugs. We still can't repro them, but I feel pretty good about it? And if the bugs are still out there, we've at least got crash reporting now so we should be able to get more info and fix it once we see it
Hope you get a chance to try it out and enjoy!