It sounds like you have the frozen radio syndrome. About 50% of the time if I have the radio ON when I shut the car off, the radio freezes when I restart the car and try to change stations via the presets. If I cycle the radio power a few times it works again. The CD works fine. I have talked to Volvo Service several times and they reloaded software, replaced the ICM but still no joy.
2005 V50 T5
IPD Rear Sway Bar
2002 S40 1.9T - R.I.P.
1998 V70 NA - Sold
Remember kids, Speed doesn't kill ... impact does!