Thank you for your reply, however i think you mis understood.
I-am talking about the Playstore only, the playstore has a blank screen (not black) and the other google apps won't load either.
So the links you send don't have anything to do with this problem.
I also have the G3 with cloudy, love it
:edit: yesterday i disabled all google apps except the playstore and play services. hopefully that helps. (she doesn't use the rest anyway) And deleted some misc apps such as some old vpn's and facebook with facebook messenger. (facebook is cause for many many problems...)