I bought a new American Standard EZ 8 sander 3/2021 and have only used it maybe 2-3 hours. It now quits after a while. We made one pass that covered maybe 50sq/ft and now it quits after about 3 ft. We wait 5 minutes and it does the same thing. No breakers trip. We have tried GFCI 20amp, regular 20 amp and 30 amp outlets. Any ideas?