JS:Miner threat

A couple of time a day I get this threat message JS:Miner threat has been detected, it started a few weeks ago. Any advise would be welcome. Avast seems to stop the threat but it would be nice to be rid of it.
Screenshot attached

Avast Free Antivirus / Pro Antivirus / Internet Security/ Premier (!)
Avast Free/Pro/IS/Premier topics and issues, not viruses or false alarms here!

Use Viruses and Worms forum section

You may have a coinminer infection. At top in viruses and worms forum section you find sticky posts with info about how to get help with removal