WinDbg not communicating with target after resuming from hibernate.

I have connected WinDbg to my target machine and I can see trace messages/ DbgPrint messages on my WinDbg window after my target boots up.
I have a test case where I need to check my driver functionality for 50 hibernate cycles. After 5-10 hibernate cycle, the connection from WinDbg to target is lost and then it is never connected again to the target for the rest cycles. But after completion of the test, when I reboot the target the connection is established again. Once the connection is lost and if I try to manually break in WinDbg target hangs, and I have to hard reboot the system to restore the connection back.

Why there is a loss of connection to target when I run hibernate cycles ? Is there some way to get the connection back without rebooting ? I am running my tests on Win8 OS.