As a family, we have five Nextbase 622GW cameras. One in each of our cars. No overheating problems on any of them. I finished an 8 hour drive today in my vehicle, with no issues. They do get quite hot, bit I wouldn't say they were overheating.
Have you checked the condition of the internal battery? The reason I ask this, is that I remember reading somewhere about faulty batteries causing overheating issues. Perhaps the battery is faulty and causing the unit to overheat?
This is copied from the Nextbase site
The 622GW has an internal battery for emergency uses, such as the loss of power during an incident. This will allow the camera to continue recording to the end of the clip before switching off. This internal battery has around 15-20 minutes of battery life. If you also use the Rear Camera added, the battery life is reduced due to the additional power draw.
How do I test the battery
1) Take your Dash Cam inside and plug it into mains power or a computer using the Nextbase provided USB cable.
2) Remove the SD card and any rear camera and press the reset button on the underside of the Dash Cam. Then turn the Dash Cam on. Please turn Parking Mode off and turn Screen Saver off as these could interfere with the test results.
3) Let it charge for 2-3 hours whilst turned off (without a rear camera).
4) Unplug the power cable, turn the Dash Cam on and time how long the Dash Cam stays on for. The time it takes for the battery to drain will help us identify the root cause.
5) Please remember that after this test your Dash Cam will once again need charging as the battery will be flat.
The battery should last for 8-10 minutes during the above test.
