Sim freezes with Connection Warning Message

not exactly…

there are two ( or more ) already existing topics. One for the fact itself that there is a “low connection warning” ( that it happens ) , and some for the different kind of popups which cause in some cases that the user can do anything , in other cases the user must press “ok” otherwise airplane crash, etc…
But at the end, as you mentioned, that topic seems a duplicate report of some of the existing bug reports about that.
Additional there is also a wish-topic too improve how the warning-popup will be shown, improve the impact on the flight, etc. ( network issues can happen, but we not want to crash because of that ).

EDIT: but it seems, the OP know that already