Last time when I tried to remove my USB I've get this error message:

Code: Select all

plasma -&&plasma(32687): Communication problem with  "plasma" , it probably crashed.
Error message was:  "org.freedesktop.DBus.Error.NoReply" : " "Did not receive a reply. Possible causes include: the remote application did not send a reply,the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken." "

It happens randomly.
What should I do?

Install debugging packages, then generating a backtrace and reporting to the KDE Bugtracker the next time it happens would be most recommended. That error message is unfortunately generic, related to the fact that Plasma is a KUniqueApplication, and trying to be started when it is already running.