Hi! Never noticed this before today. When I power up the radio there is a bumping sound similar to a servo motor that starts thumping the minute power is applied and quits when the bar-graph reaches the third bar from the left. I always keep the internal tuner OFF as I have the PW1-1 and use it's tuner. Radio just came back from ICOM in the last 30 days for a receive audio problem. 73 Bob, W3PT