Frozen input in multiplayer game

[AU]

I use Nexuiz svn trunk version, but the problem could occur in old stable versions too - can't say for sure. The Internet connection is not so fast: 150-500+ ping and up to 16KBps; but there are times when everything is OK with the Internet connection and Nexuiz behaves really strange. I can see everything moving as always, sounds play normal, chat messages arrive as always , but I just can't do anything myself. Sometimes this starts when I'm fragged and need to respawn, sometimes it just starts in the middle of the game. There are times when this problem is solved by disconnecting and connecting again (I mean only the Internet connection), but sometimes I just need to quit Nexuiz and start again. Actually, I'm behind a routed DI-624, but chances are very small that it causes this problem. Nowhere else the problem occures, and while Nexuiz input freezes it is possible to do other things in the Internet, play other games on the net......
Any help is appreciated

[AU]

Well, I think the problem can be with my Internet connection too, which goes through pptp. It can originate from provider.... Trying to test .....

[AU]

Well... Tested it. The problem is definitely with my connection So this issue is solved If you get symptoms like me, check you connection (mine goes through pptp vpn)