Choose the smallest action first
If the app opens, close it normally and reopen it. Check whether the same item still fails and whether a known control works. If the app has a cache option, confirm what that option clears on your device. Keep account setup and purchase information in a private place before clearing data or reinstalling.
Know what you need to restore
A reset can remove local playlists, guide settings or licences that need to be restored through the publisher. Confirm that you have the supported sign-in instructions and the account or store that can restore purchases. If the problem follows one channel across devices, keep the working installation intact and ask about the named feed first.
After a reset, restore one account and test one channel before adding the rest of the settings. That gives you a baseline for a guide or audio problem that returns later.