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HP Laptop - 15-dw2000ua 3M811EA

Good evening, I would like to ask for help. I have an HP Laptop 15-dw2xxx with a QuadCore Intel Core i5-1035G1 processor, which normally runs at 3300 MHz (33 x 100). When I'm gaming, the processor is running at 1000 MHz and everything functions without problems - the game doesn't slow down and runs fine. However, when I plug in the charger, a strange phenomenon happens: after a few minutes, the CPU frequency drops to 400 MHz, causing significant lag and latency. After about five minutes the problems disappear, the CPU frequency goes back to 1000 MHz, but then after a while it drops again and this cycle repeats. Any help would be appreciated.

 
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