Dead Power Seatbelts AND Windows

Hello Subaru Geniuses,

I have a 91 Subaru Loyale, Wagon, with power windows and automatic seatbelts. For the past month or so, the automatic seatbelts AND the power windows will simply not function when I start the car up - and they stopped working together. At first it happened once, then went back to normal, but now they don't work pretty much all the time. That is, the seat belt will stay in the forward position when the door is closed and the key is in, and the window will not roll up or down. About half of the time they will both start working after anywhere from 15 minutes to 2 hours worth of driving. When it kicks back in, the seat belt will move to the back position and I can then roll down the window as well. There may - I'm not sure - be a connection between them not working and very hot weather (which is most of the time here in Arizona).

Any ideas? Why would both the belts and seatbelts fail/work in sync? I've checked all fuses, and they are fine. Is there a relay that needs replacing? Where would one start troubleshooting this?

Thanks,

PP