Device.Present creates huge freezes

Hello
I use Unity3D Pro 3.4.2f3 and have some problems.
We create a game level and it works fine almost all time (actually camera has baked animation created in 3D-animation software and imported by fbx), but there are several moments in game where freezes happens. Profiler said its because of Device.Present. And it all happens in standalone build. If I try to check it in editor there is no freeze and profiler show no Device.Present anomaly
Please, help me find out the source of the problem (what it could be?)

Standalone screenshot with freeze 1

Standalone screenshot with freeze 2

In-editor screenshot of same moment without freeze

I would just upgrade to 3.5 which puts rendering in a different thread. This solved some of my glitches.