Reappearing and dissapearing brushes in hammer.

[The Hatted Man]

So after I finished the geometry of both blu team and red team's spawn.They both started having moments where if I get close to them, they disappear while I'm further away they reappear. Any fix?
Attached is my vmf file.


UPDATE: Just restarted Hammer.The problems fixed now

 

[Tuaam]

It's just a graphical glitch that happens sometimes. But yeah restart Hammer

 

[Infomaniac]

It's just a graphical glitch that happens sometimes. But yeah restart Hammer

One thing i've done is delete the brushes and then undo the action

 

[Hyperion]

One thing i've done is delete the brushes and then undo the action

That's like how you cause it to happen