dgap driver problem

good day hope you can help me.
i have a digi ccon16 connected to a linux server. there are four modems connected to the digi ccon16. the setup is for POS terminal dial up. the problem is sometimes the modems stop accepting calls. the issue is only resovled after reloading the dgap driver using MPI.
can anyone please assist



A good place to start is by checking the serial port signals using dpa.dgap.

The DCD signal should drop when a call is disconnected and the OFC/IFC signals would indicated a buffer overflow as a result of a flow control mis-match.