@Pat, thanks for the logs. I see something similar as in jibel's:
registration is suddenly dropped and then re-established after a few
seconds. Sequence is (1: registered, 0: non-registered, 2: searching):

08-25 21:31:13.108  2160  2169 D AT      : AT< +CREG: 1,"1B48","07EF7DA3",6,0,0
08-25 21:34:34.482  2160  2169 D AT      : AT< +CREG: 0,"FFFF","0FFFFFFF",0,0,0
08-25 21:34:34.489  2160  2169 D AT      : AT< +CREG: 2,"FFFF","0FFFFFFF",0,0,0
08-25 21:34:53.145  2160  2169 D AT      : AT< +CREG: 1,"1779","00007DA3",3,0,0
08-25 21:35:06.616  2160  2169 D AT      : AT< +CREG: 1,"1B48","07EF7DA3",6,0,0

I checked that there are no suspicious AT commands triggered from our
side, so this looks like a modem firmware bug. There is a small chance
that we need to set some configuration to avoid this though.

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https://bugs.launchpad.net/bugs/1607823

Title:
  Cellular connection drops out

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