2005 Stereo Deck going crazy
 

About a month ago my sound system starting acting funny, it would only play out of the right channel and randomly come back to the left channel but quickly go back to only being the right side. It seems to be related to some sort of loose connection or something as it would happen with bumps.
Now suddenly today it started randomly going through settings in the deck without me doing anything or even moving. I tried disconnecting the battery to reset it but that didn't do anything and now I'm completely stumped. I've attached a video so you can see what exactly its doing.

VIDEO: https://drive.google.com/file/d/14TW...ew?usp=sharing