I have one, bought it new a few years back! Hearing your stories, I feel fortunate! I have not had any problems, as many have discribed here! I did notice last Halloween, however, that the beaker does not light up any more! Has anyone had THAT problem?
Also, I think your only hope to fix these issues is to do like many have and disect your good Dr. and see if you can find a loose wire. Boy, if there was someone running a business of fixing this stuff, they would be rich!!!
I also think we should all email Gemmy and suggest they bring back the good Dr.