This sounds like a CPU throttling problem. You may be able to solve the issue by setting an 'always on' power scheme in Windows or you might need to switch off the feature in the BIOS. For Intel this is Speedstep and for AMD it is either PowerNow! or CoolnQuiet. If you search the forums for 'speedstep' you may well find various bits of advice on resolving this issue.
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Cheers, Steve
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