BrokenPipeError #8

My python program uses monkeylib to drive an application on an Android device. It works fine for about 3 hours and then crashes with this trace:

  File "monkeylib.py", line 119, in tap
    res = self.send("tap %d %d" % (pos[0], pos[1]))
  File "monkeylib.py", line 47, in send
    self.sock.send((cmd + "\n").encode('utf-8'))
BrokenPipeError: [Errno 32] Broken pipe

It crashes after running for 3 hours (+/- 1 minute). Is there something about the monkey program that quits after 3 hours that would cause the pipe to break? Any ideas about other processes on the Android that could be interfering? Any tips on a workaround?
Thanks for any advice you can offer.