Thanks for getting back to me. Here's some answers, I hope they help :
Have you notice any specific time interval after which the app starts crashing once you've rebooted your device?
I haven't so far, but I will try and see if I can find a pattern. It's a little hard because I 'll have to keep checking, but I 'll try and will update you if I succeed.
Which cloud sync are you using?
Have you upgraded your device from Windows 8 OS to 10?
Yes, 8.0 > 8.1 > 10
How many total items are there in Enpass?
After using Enpass, do you quit it or it keeps running in Background?
I always quit it. If I sometimes forget, I quit it the next time I see it open.
At the time of crash, please observe if the internet is available in phone? (Asking to learn if it could be related to known issue in Microsoft Licensing API).
Internet is almost always available at the time of the crash. There may have been a couple of times when it wasn't, but 9 times out of 10 it is.
Did you purchase Enpass from same country/store where you're using it now or you've switched the country in store?
Same country and store.
In which language and region are you using your device?
Language > English (United States), Region > Greece
Thank you again for your time and effort in looking into this !