Question System lagging Win10

Oct 11, 2021
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I have had a Lenovo Ideapad 330s for 3 years now and recently its been having some problems. If I leave the laptop to idle then come back an hour later the whole system lags, like moving the mouse takes a few seconds. I touch the touchpad then wait and see the mouse move after a few seconds, if I try and close a window it takes a few seconds, some icons are missing from the taskbar (invisible I can still click on them just dont see what they are). Also the cpu fan runs at full speed for minutes, I have had it serviced they cant find a solution, hdd has been changed for a ssd, whole system has been done twice in 3 months now, the problem goes away for a week or two then just comes back. The laptop is a Lenovo ideapad 330s 15 ikb i5, cpu is 8250u, it has a radeon 530 graphics card and 8 gbs of ram.