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Site certificate invalid - Thunderbird

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I use Kaspersky antivirus (free) and am receiving the attached warning at seemingly random intervals (every 1-2 days I think). Thunderbird is always open at the time but I am not working in it.

Using Thunderbird 83.0b3 (32-bit) on Windows 10.

Not being a techie, I don't even know whether to "Disconnect" or "Continue".

Is this my problem or Thunderbird's? Thanks for any assistance.

I use Kaspersky antivirus (free) and am receiving the attached warning at seemingly random intervals (every 1-2 days I think). Thunderbird is always open at the time but I am not working in it. Using Thunderbird 83.0b3 (32-bit) on Windows 10. Not being a techie, I don't even know whether to "Disconnect" or "Continue". Is this my problem or Thunderbird's? Thanks for any assistance.
Attached screenshots