My 95 SC400 has a problem that goes on and off where it will downshift randomly as I'm driving. Sometimes when I turn it on it will be stuck in first gear. Other times when I turn it on everything works fine. Also the speedo and rpm needles wont move sometimes unless I slap the dash idk if that's related but it's happening. I changed the shift solenoids and that didn't help and my fluid is full, doesn't look/smell burnt and no tf leaks either. Anyone know what I should do??