TECH: 1991 Cadillac Eldorado Digital Display Panel

I recently bought a 1991 Cadillac Eldorado with 91K miles. Sometimes
the digital display panel will go into "reset" mode when I'm driving -
the "Service Engine Soon" light will go on, the speedometer will go to
"zero" and the gas gauge gallons indicator will start flashing. Also
the Driver Information Center said, "System Problem - Service Car
Soon," and the heater would turn on automatically. If I turn off the
engine and then restart, everything is back to normal and will work
properly for a few days. Would this indicate a system computer is going
bad? Many Thanks...