Fix 1 : Disconnect and reconnect to the Internet, and restart the ps4. The PS4 not playing TV and video apps probably can be a bug in the PS4 update or glitch in the PS4 system. A normal restart to the PS4 should fix such issue. Please restart the PS4 and check if works.

Why is PS4 getting rid of communities?

This is reportedly due to the rising usage of subscription-based streaming services on the consoles. However, fans will still be able to access the content they have already purchased with on-demand playback. Sony has not currently given out a reason as to why the Communities feature will be removed.