The memory check kick is a plague brought in with the last update, while the freeze-on-join is a peculiar problem of GTA.ru since it happens only there, I'm not sure what conflicts with it because only few people get this issue, like me and this Cris guy.
I don't know about freezing-on-join problem, but crc-bug occurs every time you are afk.
Hi. This crc-check bug is well known, fix was sent to the hoster, but the hoster doesn't care about server, that's why this bug is still present. As for ping, if yours is 500 or higher, you'll be kicked.