When I had my problem in the No Geo. mountains in 30 degree weather, I was having furnace trouble and all kinds of weird problems... One minute my batteries showed fully charged, the next minute I had only one bar, dim lights, and no furnace etc. After much research online I found everything pointing to the lousy converter that comes in these units and many others. Tons of problems. But no problems with the Progressive units... After my mountain fiasco, it gave me great security knowing I won't have that problem again. I will be curious to see what your problem turns out to be.