I've always popped popcorn over the stove but now that I've moved into a new place, the popcorn doesn't seem to be popping and the oil burns. I am using fresh popcorn and the same pot and oil that I used to where I used to live. The only difference is that now I have an electric range. However, a while back I used to have an electric range and had no problem with the same exact equipment. What could be wrong?