I don't own one, but when a MD starts "spazzing out" there are a few common causes that you might consider:
1. Electromagnetic Interference (EMI) from wires, etc. in the area
2. Weak batteries
3. Dirt/sand under the coil cover (I did this to Relichound once.)
4. Loose, or damaged, coil wire and/or connections
Hope you get it fixed soon...spring is right around the corner.