AVG free update interferes with emails

I've used AVG Free for many years and had no issues with it until recently. In the last two or three months I noticed after getting an update, a day or two later my email program can't download any emails. I'm using Thunderbird. I ended up deleting AVG and reinstalling it and that fixed the issue until I got the next update. If there's some setting that needs changing I wish someone could tell me what it is. Thanks

Hello Steve,
Thank you for contacting AVG support community.
We apologize for the trouble caused.
We have sent you an email regarding your concern.
Please do check.
We will certainly help you out.
Thank you.

Hello Steve,
Thank you for contacting AVG support community.
We apologize for the trouble caused.
We have sent you an email regarding your concern.
Please do check.
We will certainly help you out.
Thank you.