We have noticed the same thing on our RUT950. We have a Jetson Xavier and a RUT950 inside a box. The Nvidia system is around 50C while the temperature on the RUT is at 80C. It makes no sense that the value is 30 degrees higher when the two devices are a few cm apart. It could be that there is not enough airflow through the RUT950 enclosure or the heatsinks are insufficient for the device. We are going to look at placing an internal fan to move the air around the box (additional to the one already running on the Nvidia system). My last resort is to remove the Teltonika enclosure so that I can direct airflow across the circuits.
Considering these are intended for vehicles and similar industrial applications - I am highly concerned over the high temperature values we've received.
Were you able to address this and bring the temperatures down?