Hi and thanks for answer.

No i can't find any <STORE> exceptions in the trace.  Actually everythings goes fine from service->process->operation. It just stuck there after the request. Messagestate for process is "Delivered"

I have also checked the processes in system operation/processes and all processes for current namespace are in state of EVTW.

The Net.HttpRequest process in state of READ


However it might  be a memory problem as you think and we have to check it out