I have 2 problems with my 1990 Buick Riviera, not sure if they are
related, b/c they began at the same time.

First, I noticed the keyless entry wasn't working, so I thought the
battery in the fob died.
I then tried to push the auto lock/unlock button on the inside of the
door to no avail. Locking/unlocking can only be done manually now.

The next day, the dashboard lights went out. with only "00" for speed,
"ERROR" in odometer & red 'Electrical Problem' idiot light.

However, this problem is intemittent, as the regular lights sometimes
light up for a while, then shut off again, all during a 15 minute trip.
Hitting the "test" button lights up everything normally. A good smack
above the display gets it to come back on, but not regularly. Worked
once about 2 days ago, and once today.

Ideas?????????????????