We had stability problems with ICQ Transport starting yesterday morning. This was caused by a certain version of libpurple. Issues should be fixed now.
Please note that with Spectrum transports crashes (not “normal” stops or restarts) it might happen that your client thinks it’s still online. Therefore some contacts appear online even if the client is not really logged into the transport at the moment. Spectrum developers are working on this issue. Until then I just hope that the Spectrum transports run stable. ;-)
With the new libpurple Gadu-Gadu transport should finally be stable, too. We’ll see how this works out in the near feature.