Apps slow and not working

Is there someone with another possible solution or place I can go to, or should i just buy a new phone? I cannot even use Spotify anymore without wifi. Any help is appreciated!

The so-called factory reset doesnā€™t touch the installed OS and canā€™t fix any OS parts possibly gone bad, it only resets any user-related stuff (data, Apps, settings), so ā€¦

Since the factory reset didnā€™t help, it may be a part of the OS having a problem, in which case an OS install from scratch should fix it, as suggested, even if undesirable.
We can try to help with this in case any questions arise.

Okay thanks for explaining, that makes sense, Iā€™ll try this weekend!