04 s60 - ABS warning came on and soon after dashboard seemed to completely shut off. Temp gauge, speedometer, etc. Turns back on after car is restarted, then shuts off soon again after. Car runs a little sluggish when it does this.

 

Sounds to me like you are losing power. With the car idling, check for voltage at the battery and let us know what you find.

 

Best thing to do is use a good scanner,to see what code you get,if you need ABS,I get them at great price,let me know.