Hello,
If your user is stressing the docking station electronics to test the fix, it would be expected that the system gets warmer than when not. Charging circuitry, memory, and power supply all need to dissipate energy.
Is there not a confusion between the temperature of the environment and the temperature of the device?
If the environment is above 40°C, then the passive cooling design may not be sufficient for proper operation.
Some electronic device user guides also provide humidity level when the device in itself doesn't produce moisture, but is rather sensitive to it.
This question is for the manufacturer though, as DisplayLink only provides one chip in the full system.
Regards,
Alban