Hello @RobertWoW,
I know this is a pain. Here is a solution that I 'created' years ago that works the majority of the time.
First, let me explain what is going on:
When you join any ARMA server that uses the 'Signature Check', which almost all do, your machine will compare your mods against the server's via the 'key' file. If your HDD is fragmented, slow internet connection/issues, low RAM, or a slow PC, the check will 'time out'. Example: When it your PC checks the 'CUP' mod, ARMA is saying you have 5 seconds to do this. If your PC does in that time or
