I have this problem with suddenly flickering of some elements visible on my screen. Then in the 'taskbar at the top' the desktop environmets keep scrolling from alpha to delta, right click popup windows come up and go, applications start up multiple times etc. I can not stop this. Sometimes I have to wait and it ends within a minute or so as a clear desktop. Other times I have to wait longer and once the I had to reboot by pushing the button.
As I do not have a clue about the reason
I do not know which information to add for the ones trying to help, so just ask what you need to know to help me.