Squawk Box 4

Has anyone experienced the transponder becoming stuck in Squawk Box4 "SBY" mode? I have tried everything that I know to move it to "normal Mode", but it will not change modes.

I disconnected the radios from the system and they work with FSX radios with no problem.
Now they use to work together with no problem until recently, then they stopped working oneday altogether.

When I use FSINN instead of Squawk Box the radios work without a problem, so we know its not the radios.

Please help!

Capttlm