Dude I had the same problem! OMG it sucked!!!
I removed icq like 5 fucking times!
I e-mailed ICQ support and 2 days later they got back to me. It actually sounds like it's a problem with the icq servers connecting to your icq. Also it might be because you have too many people on your contact list.
So delete me and a few others and you should be fine
DH