I am aware of the issue, based on help with debugging from user experiemcing the issue seems to be network related issue - wallet freezes as a result of very slow but not failed network connections that resolve after 10-20s.

It's random nature, I could not simulate it unfortunately. I have a hypothesis it is caused by ipv6 connectivity issues.

Will try to reconfigure the reverse proxy tonight and see if it helps and does not break anything else.