The other day I had the stock radio in my (new to me) 2002 V70 cranked pretty loud and the display started flashing. When I turned it back down it stopped flashing. Is this Volvo's way of telling me to turn down my radio? I don't see anything in the owner's manual about it. Wondering if anyone else has experienced this or knows if this is normal.

 

After turn the radio,You will still persist this issue then The problem is in your radio battery So change your battery.It would be help for it.You can face flashing issue on it.