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my laptop suddenly makes 3 knock knock sound repeatedly out of nowhere,

HP Recommended
HP Pavilion Power - 15-cb075tx
Microsoft Windows 10 (64-bit)

everything else if fine on my laptop. everything else is working fine . first i thought that might be a notification sound of any software, but i  figured out there is no such sound on sound system in this laptop, these loud knocking sound sometimes happen very often and sometimes does not happen at all. i search everything  to stop this sound but did not find anything. there is no virus nor such thing on my laptop, i keep everything on check very often. i just want to figure out what is the source of this sound to stop it.

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