I had a similar problem with mine, hit the regulator and it went up. I pulled it apart, checked out the circuit baord and sure enough there were dry soldered joints. Have a look over the circuit board, you will see terminals coming through it that the solder has let go of. There will be a ring around the terminal where the solder isnt touching. Get a small soldering iron, put a drop of solder on it and all is good. Let me know how you get on.
Ken