[Wizard]

Check and clean the connection at the power transistor. Often this connection gets corroded (especially up here) and can cause intermittent connection. Also make sure you have the retaining clip installed. You could also have a failing power transistor. Most severe problem is going to be the ECU. Might not hurt to check this as I had one that did the same thing as you described and several weeks later heard the infamous clicking in the console.

Wiz