This has been going on for a while, but getting much more frequent lately. 1997 D1, at times, EVERY window, including sunroofs will refuse to work. They may come back in a few minutes, or it may take an hour or so, but when they work, everything works perfectly. I've swapped window ECUs already, checked the power supplies to the ECU, everything seems to check out. The circuit seems simple enough according to the wiring diagram, but the problem still eludes me. What could be shutting down the entire system like this?
