Key fob functionality issues

Car not responding to key on 2013 Prius v. When I press on fob, it doesn't open/lock doors unless I continue to press button multiple times. (Sometimes it works with one press, other times it needs 10+ presses.) Once inside, the car often doesn't recognize key is there and puts up the warning light. It will only start when I hold key fob next to start button.) I have changed the battery multiple times, thinking that was it. I did just discover that when I press the key fob button, the red light doesn't always illuminate.

So maybe it's something in the "wiring" inside the fob?

 

Brand new batteries...they work fine with other devices. I think we can rule that out as the reason.

 

Nope. It does work intermittently well. And other times it just craps out. Thus, it can't be an upside down batter.