ScorpiuS

Hey guys, last night I was driving down the road and my car was decently warmed up I thought, it was about 18 degrees out, and I let her sit for about 10 minutes before gettin in, well I was going down the road about 35mph all of a sudden my radio got fuzzy and my speedo gauge dropped below 0, then it bounced around 35mph and dropped a couple times again, it looked crazy, so I pulled over listended for some irregular noises but didn't hear anything, waited about 5 minutes, drove off and she drove perfectly fine. Any know what exactly happened, it doesn't sound too harmful I was just curious? Thx!