Error during long test runs

Hi,

From time to time I am receiving the following error:

Possible reasons:
1. The device was disconnected.
2. The application prepared for TestComplete is not running.
3. The application stopped responding.
4. The application was compiled incorrectly.
5. An error occurred in TestComplete.

Technical information:
149 0x80020006 (Unknown name.)<----- This part is always the same

It happens only during long test runs (test suites). I can receive this error in any test of any sequence. But when I launch this single test separately, it goes fine. 

Do you have any ideas?

Thanks!