Have a 2006 Terraza - several electrical issues - DVD player, keyfob, doors...

What is your question?

I currently have several nagging issues with DVD player not working. The 2 keyfobs are not working. Right sliding door will not open from front control swith or from inside in right-back seat. Could these issues be related? The keyfobs haven't worked for a few months like the door. But, the DVD player stopped working this week when the battery died (after trying to jumpstart...and mechanics doing diagnostics). I'm concerned something chronic is breaking down in the electrical system. Any ideas on how to resolve?