Volvo: Volvo s60 2003, periodic blackouts, srs airbag

Question
Car dash has periodic blackouts.  Speedometer won't work, odometer won't work, gas guage won't work, sometimes power windows won't work, clicker to lock the doors usually doesn't work.  Lock doors manually.  Let car sit for a while and clicker won't unlock the doors.  Have to use the key.  Alarm goes off.  Start car and blackout is gone.  Everything is working fine except the srs/airbag service urgent light is on.  Dealer says they can't diagnose the problem unless they can duplicate the problem.  It did not happen for them.  They say it's like finding a needle in a haystack.  the only thing they do is turn off the srs airbag light.  They don't fix the problem and charge me $130 for nothing.  Can you help?

Answer
Dana,
A reprogramming of the cluster might help, or do you feel you are loosing power to the cluster? If power loss is the problem look for poor connections or grounds. Try reading the fault codes as they could lead to the fault. When the cluster goes out can you communicate through the OBD. Can you monitor while this happens to see if even if you loose contact through the scanner? You could try to disconnect the battery overnight to allow the entire system to "reboot" in the AM.