Hi
TommydertomThank you for your asking. Did you try to install the Fan dongle which is affiliated with the phone in the box? If so, please provide the information below so that we can better assist you.
1. Your current firmware version
Settings>System>About Phone>Software information>Build Number
If you try to update to the latest version, does the issue still persist?
2. Does the issue happen with idle or using any specific apps?
3. How's the issue frequency?