I am experiencing the same problem with network-manager-kde
Here is the output on my console:
knetworkmanager(2607): KUniqueApplication: Cannot find the D-Bus
session server: "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."
Pipe closed unexpectedly.
Unfortunately in my case the problem
persists after purging/reinstalling of network-manager and network-
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