Started happening to our S60 a few months ago. No idea what's causing it. Hopefully you guys can help. So while the cars is on ever couple seconds all the gauges will go to zero and all the warning lights will come on for a split second then go back to normal. The message center screen also just show and buch of jumbled words.

 

Probably time to get instrument cluster rebuilt. Easy to do. 4 screws hold the cluster in (see YouTube). Go to ebay and search for Volvo Instrument Cluster repair. I did mine because many bulbs were burned out and the gauges would work intermittently. It's been great ever since.