When I use I tunes radio,click pause,leave mac to go into sleep mode,wake mac

when I use I tunes radio,click pause,leave mac to go into sleep mode,return  press play I tunes will not resatrt on same station. I have to pick another for a few seconds and then return to original. then it works ok.
not a big problem but its annoying. Any ideas ?
thanks very much

I lugged the G4 around town to three different computer repair shops, and they all confirmed that I had installed the fans correctly, and all fans were running fine. Of course, this only makes the problem harder to solve.
Furthermore, my friend was using the G4 last night when it was a cool 72 degrees (F) in his apartment, and the computer still forced itself into Sleep mode after just over an hour of use. He was using Final Cut Pro at the time, editing a project spread across two external FireWire hard drives. I just can't imagine this amount of activity overheating the G4, which was my editing workhorse for six years before handing it over to my friend.
When I replaced the cooling fans, I did select new fans with slightly lower airflow than the original fans (which many people have replaced, due to the amount of noise they produce). Any opinions on whether that could be the issue?
_Case fan:_
Original: 151.85 CFM airflow
Replacement: 109.6 CFM airflow
_Power Supply fans:_
Original: 38.1 CFM airflow
Replacement: 26.5 CFM airflow

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