Low amps all the sudden

Hey all, I hope that you guys can give me some feedback. I have been running a 100 W + HY-mppt20 for the last six months and not had any issues at all keep in my house batteries topped off. This weekend I started getting errors that Batteries were dropping low. Looking at my charge controller I see 13.2v & 0.5a coming in from the panel and 12.2 & 0.5a at the battery. This is on the MT-50 screen. 0.5 A seems weird to me. I feel like in months past it's been 4-5's. I'm in SoCal panels in direct sun.

I have removed the cables from the panel and measured amperage at the plugs i'm still getting .4 - .5

Any thoughts would be appreciated
-B