We have had 6 Teltonika RUT950 with the same issue, the mobile antenna connectors on the pcb board have broken off fortunately does not affect the WIFI aerial connectors for we don use wifi.. but often the mobile aerial connectors are not very stable
There is another older model RUT950 with the sim cards inside the device, the aerial connectors are attached to the circuit board, but the new version appear to be solder glued to the circuit board...
I think there needs to be a design change in these devices.