I've noticed KDE seems to be freezing when dropping out of my ppp0 (mobile broadband) connection. The drop outs happens quite often ever since I installed Ubuntu/Kubuntu 11.04 (both distributions), so I have a feeling it's not my modem or my ISP causing the drop outs.
Since I do get disconnected often KDE freezes just as often, which will force me to leave Kubuntu 11.04 until it's fixed. I will try Kubuntu 10.04 if possible to see if it's better there and report back here.
Until then, anyone has any suggestions?