HTTPS scan blocks access to our website for our customers

Hello,

AVG is blocking access to our website for our customers. Can you help fixing this problem?

The error they and I get on the JS file is:
ERR_QUIC_PROTOCOL_ERROR.

Sometimes the second time reloading, or reload without caching, solves the problem. But that is not a solution for customers.

edit:
Disabling Quic on de VPS solves the problem, but that is not ideal.