I had this happen a bit.
If you are using Chrome, 1) clear your cache in Chrome 2) reset your Google Ad ID. There are some malicious ads that have made it in to the Google ad network.
Option 2, was moving to a different browser with ad-block. Resetting the ID works for a while but using ublock in Firefox has completely eliminated this for me.
sandisk 480GB ssd
Cooler Master Elite 130
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