I recently picked up a 2004 S60. I an driving across country. While in Wyoming, the car felt like it dropped down 2 gears. It did this 6 times in 10 minutes. Then the ABS light came on and pull over safely. Shortly after all went dark. All instruments went out. I was able to exit and shut down the car. It started up with the message Air bag service urgent. This message remains but all other problems cleared up. So far I have not found any loose connections. The clock lost 4 minutes. The trip odometer value changed form over 1000 to 39. I plugged an OBDII in and there were no codes. Suggestions appreciated