Since last update plasma freeze

[MERLIN Philippe]

Hi!
my computer is on Debian Sid Kde AMD64, since last update the 
windows open by plasmashell remain open, the cpu increase to 90% 
steadyly, an htop show that the cause of this increase os CPU is the 
Xorg process .
i kill plasma and restart plasma and each time the message " trying to 
show an empty dialog" appear nothing work at all.
i look at the last update  of 13 march  the library libc6 and libc-bin 
update 2.22-2 to 2.22-3.
May you help me to solve this annoying problem.
Philippe Merlin