Blacklist threat coming up constantly - every few seconds

I posted about this problem on the bottom of someone else's thread the other day, but can't figure out how to get back there to find out if someone answered me, so I'm posting again in my own thread. Looks like lots of people are having this problem at the moment!

Version: 19.3.3084 (build 19.3.4241.445)

Hello Abbie,
Thank you for reaching us via your own thread.
You can visit that topic using this link: https://support.avg.com/answers#!/feedtype=SINGLE_QUESTION_DETAIL&dc=All&criteria=ALLQUESTIONS&id=9060N000000LmaD
Are you receiving that threat detection pop up when you browse internet or randomly or when you visit a particular website? Please click on 'See details' and share the full screenshot along with its path.

Hello Abbie,
Thank you for reaching us via your own thread.
You can visit that topic using this link: https://support.avg.com/answers#!/feedtype=SINGLE_QUESTION_DETAIL&dc=All&criteria=ALLQUESTIONS&id=9060N000000LmaD
Are you receiving that threat detection pop up when you browse internet or randomly or when you visit a particular website? Please click on 'See details' and share the full screenshot along with its path.

To start with I thought it must be to do with a website, but then I restarted and it happened as soon as the computer turned on, when I hadn't opened any programs yet.

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