Description of problem:
As title, after using KDE for certain time, I am not able to open up multiple GUI program. The error message is :

Maximum number of clients reachedokular: cannot connect to X server :0
(Here takes opening Okular as example.)

I have googled for answer, other informations are  like this:

[kira@localhost ~]$ xlsclients | wc -l
78

[root@localhost kira]# lsof -p 860 | wc -l
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/500/gvfs
      Output information may be incomplete.
321

(860 is the pid of XServer)

I could resolve the problem by logout/restart X, but this is still annoying.

Version-Release number of selected component (if applicable):


How reproducible:
Often if you open up the computer for too long

Steps to Reproduce:
1. Start up.
2. Don't shut it down for maybe few days.
3.


Reproducible: 

Steps to Reproduce: