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i recently bought a RUT955 and installed two SIMs, from two operators. One of the links keeps disconnecting from the Data service. the other sim works fine, had days without interruptions, so I dont know where to look or what settings to check.
First of all you should try some troubleshooting:
1. I will assume you are using the latest stable firmware? https://wiki.teltonika.lt/view/RUT9xx_Firmware
2. Just to make sure you do not have Mobile Data On Demand enabled? Because your router is behaving really similarly as if this option selected.
3. For the most details logs. You can connect to your router via SSH. For example if you are on Ubuntu. Open Terminal. Type in: sudo ssh firstname.lastname@example.org
the firmware is updated, I do not have the on demand setting active, nor the SIM switch, the log basically is this, I dont see a specific reason for disconnecting. Could it be the forcing LTE? even thou this option is not enabled?