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If I remember right this is a laptop. Since it runs fine for 4 hrs and then starts shutting down. I suspect it is a case the computer is getting hot. This causes errors to start happening because the processor is not getting enough air.
You could try a cooling stand that has fans in it. I know Wal-mart has a couple models and not expensive, though I would make sure it is one that has its own power and is not powered by USB.
The other thing is if you have had and used this computer for a while (6 - 12 months or more) then take it to a reputable repair shop and have them clean it. If these get enough dust built up inside then they don't cool as well.
One thing that may help with your offset is try lowering your page file size. I know this sounds a little wierd but MTU tried this on a couple computers and it actually helped with the sync. My guess would be that it forces the computer to use more of its memory to store the playing song file and less of the page file. Memory is faster than having to go to the hard drive to get data.
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Dale Douglass 2nd Generation Karaoke I am not a member of the MTU Staff.
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