I recently bought a Buck Rogers with a Ni-Wumpf version E board in it and recently several of the playfield lights stay lit even when a game is not being played. Right now, both of the B's, 1,000, 5,000, 9,000, 5x and the 1 and 5 base bonus are always lit. The game will advance the bonus lights from 1,000 to 2,000 and so forth. Also if I hit U, C or K, they will turn off like normal. The problem comes back even when I turn the game off and back on. Any ideas what is causing this?