Recreational Vehicle Lpg Tank Valve/gauge problems of the 2011 Chevrolet HHR

In colder temperatures my car sputters when accelerating and rpms jump quickly from 2 to 3 and then back down. In addition, the radio may turn off, all dash gauges (fuel, speed, rpms) go to 0, various service lights come on (not always the same) and then everything goes back to normal. Car works fine in warmer temperatures. Took it to the dealership in 2013 and when plugged in there were reports if 20 things wrong and they were unable to determine the problem and said it would cost thousand to check all of the issues being reported. I contacted gm customer service and although they were very nice they weren't able to help determine what the issue with my vehicle was. I took it to another service place and while they were unable to determine the ultimate problem they put dielectric grease on all my electronic connections in the fuse box under the hood and it worked fine the rest if the winter. They said it was a good thing that I came in when I did because they thought if I drove it any longer I would have destroyed the electrical system. In 2014, I had them do the same "fix". Now in 2015 it has started back up again.