I assume you're the guy who was asking about this problem in Atlas Park on Infinity? I was the guy who suggested you post about it (Captain Firekin). However, I specifically said you should post in the 'Technical Issues and Bugs' section. It's further up on the forum listing, in the second section ('Development').
Also, you need to give more information. When you restart CoH, how long does it take for the problem to return? Is anything else affected? Can you post a screenshot? The more information you provide, the greater the odds that someone will actually be able to help.
Paragon City Search And Rescue
The Mentor Project
I'm having this problem when i play the game for like an hour my buildings disappear and i have to restart the game to fix it.Please If you fixed this let me know how you fixed it thanks!