I have the same remote as you, I use it with a 12 or 13-amp (I think) shop vac. I have been using it at least three or four years w/o problem.
Before replacing it, I'd get to the bottom of the problem. Right now, it seems to be the weak link. If you find a unit that can withstand whatever current you're throwing at it, well, maybe the wire in the wall will be the weak link. Maybe something will catch on fire.
I'd start w/ an ammeter on your DC.