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Disconnections with 1.18.6 on Meteo-40 data logger

I upgraded ModemManager from 1.14.12 to 1.18.6 on an Ammonit Meteo-40 data logger but it caused some issues with the PLS8 modem. The data logger runs debian buster on the Stamp9G20 board from Taskit.

After I upgraded, I created a basic NetworkManager configuration which I can bring up with "nmcli con up Modem2". The modem state changes to "connected" and I can e.g. "ping google.com" and get an answer.

However, as soon as I try to do something more bandwidth-intense (e.g. "apt update") the modem disconnects. These are the logs from ModemManager and NetworkManager when that happens. After the modem disconnects, it also vanishes from "lsusb" (and "mmcli -L").

The same modem was working fine with 1.14.12. I tested it with the same configuration and 1.18.6 on an amd64 debian buster PC, and on armhf raspian buster, and it also works fine. I haven't checked any other modems.

These are the new packages that I'm using:

Does anyone know what might be causing the disconnect? I can provide SSH access to a system if anyone is interested.

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