Thread Scheduling Problem ( WinCE 6.0)

I have:
Visual Studio 2005 SP1,
WinCE 6.0 R2 with all updates up to november 2008,
Cirrus Logic's BSP for EP9302 (ep93xx).

To test my newly created OSDesign I tried to run a dummy application of the
"infinite loop" type. It have to be run once a second . Regardless of the
loading and executing method its normal work terminates in 30-35 seconds.

1. The application is loaded to my device as a part of OS (subproject). It
contains Sleep(1000). It's working for approximately 30 sec and then
everything hangs.
1-А. The same (subproject), but Sleep(1000) is replaced by permanent calls of
GetTickCount () (I know it's a bad practice!). It's working for an unlimited
time, but it's not what I need.

2. OS is downloaded to my device, the application is run by VS 2005,
connection through TCP Connect Transport and specific IP address.
2-A. If it contains Sleep(1000) it runs for the same ~30 sec.
2-B. If it contains GetTickCount () calls its working OK. But when I try to
debug it, i.e. set a breakpoint, watch registers, step over, etc. the remote
connection to the device is lost in about 30 sec.
2-C. I've added to the main thread containing Sleep(1000) the second
background thread of lowered priority (THREAD_PRIORITY_BELOW_NORMAL)
containing GetTickCount () calls. I've tried to trace its performance by LED
blinking from the main thread and by debugging messages (RETAILMSG) from both
threads. In 28-35 seconds the execution of the main thread stops, the
background thread is still working.

In addition, if I stop sending debugging messages or try to send them more
rarely (e.g. in 10 sec), again the connection is lost in the same ~30 sec.

I'd like to know, where can I found the thread scheduler in WinCE 6.0 R2?

Or maybe the problem lays somewhere else:
- In my OSDesign?
- In Cirrus's BSP (I've found there several insignificant errors)?
- or elsewhere?

Thanks in advice.

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