sounds uncanny like your cpu is either overheating and 'throttling', or one of your programs is taking the cpu resources (check this out in task manager first).
Check your CPU and GPU temp when its doing it, if you know how, games are very cpu hungry and its almost the only time where your cpu will overheat including extensife cpu usage in windows.
If your CPU is above 59'c it may be throttling, if its any higher than 70'c then thats cause for alarm. I believe the GPU can handle much higher temps, about 90'c+ before it starts causing problems
If everything is normal (upto 50'c) come back to us




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