Force 300 set up as a PTP link won't stay connected?

I am trying to set up two Force 300 units as a temporay PTP link.  I have one set up as a AP and one as a subscriber.  The two units don't stay connected for more than about 20 seconds.  I have tried versions 4.3.2-; 4.3.1 and with the same results.  Veresion 4.3.2 Doesn't give me a choice between the first subscriber module and setting the SM Mac Address.  Nor does it give me any choices in the driver mode, all I get is TDD.  

Any suggestions?