Sandbox starting after two hours delay by cistray.exe - known?

Hello,

i have a browser being used via Sandbox. Most times when i start it via widget-click,
cistray.exe works at 25% CPU for up to 2,5 hours. No disk activity. After this long delay
time, the browser pops up. Is this effect known?
Basic info: Comodo FW version 8.2.0.4792, Windows 7 64bit.