Hi im new here , same thing happened to me last night and is still today i turn phone off last night and turn it on today but the store keeps crashing after opening it , this is the first time i?ve encountered something like this on my windows phone , bought it from walmart for 30 bucks ( AT&T Go phone ) and unlock it but haven?t rebranded , gotta say that i was in insider preview and never encountered this problems and when AT&T began rolling out Windows 10 i use WDRT to rollback to windows 8 and update " officially " so now i am in the latest .420
So if any of the experts here can help , don?t want to Hard reset as i think with an official update and official build this would not be neccessary and talking about an app gap problem when not even your store opens up you have a big problem right there .
Sorry for rant , thanks everybody .