I'm contacting you again. Meanwhile I've updated W10M on my Lumia 640 to 14393.5 and the issue is still present - app crashes immediately after starting, need to reboot the phone to make it work again for a while (6 hours or so).
My answers to the questions you prepared for Nixx:
- Have you notice any specific time interval after which the app starts crashing once you've rebooted your device?
-- 6hrs after first time logging in the app.
- Which cloud sync are you using?
--OneDrive, but it happens even if I disable sync.
-Have you upgraded your device from Windows 8 OS to 10?
--Yes, 8.0 > 8.1 > 10 (10586) > 10 (14393)
-How many total items are there in Enpass?
-After using Enpass, do you quit it or it keeps running in Background?
-- I keep it running.
-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).
--The crash happens even in airplane mode or when connected to WiFi or 3g, every time.
-Did you purchase Enpass from same country/store where you're using it now or you've switched the country in store?
--Not sure 100% but I think I didn't switched store.
-In which language and region are you using your device?
--Language > English (United States), Region > United States, Regional Format > Croatian