All dashcams use internal thermal sensor inside Novatek chipsets.
Maybe they had but this thermal sensor was not working in a way to save the camera against heat damage. Maybe it will work on A229 Pro.
I don't know any Novatek dashcam which was auto shutting down because of heat but I know dead dashcams because of heat. Melted buttons, melted lens case, melted case. They can never melt if the dashcam is turned off, they will melt if something is obstructing the natura ventilation of the camera which is recording in that moment.
If the user is using a windshield sunshader in parking mode during summer the dashcam will be killed by the heat, other components inside the dashcam will be destroyed, not the main Novatek chipset. First which will fail will be the super-caps and then the power circuit. Sometimes is killed the CMOS.
That thermal sensor should be mounted in another place, not inside the chipset.
I expect about 5% from Novatek dashcams to be killed by the windshield sunshaders. If 90% of the people will use these sunshaders in paking mode, 90% of the dashcams will be killed. This is a serious thread and nobody cares about it. Maybe the manufacturers accept adding 5% loses because of windshield sunshaders.
Viofo displayed shut-down message to prevent overheating, Vantrue remained recording and did not reboot
It is normal Viofo to reach higher temperatures than Vantrue because it is much more closer to the windshield, the air is not so well vented on the wedge type dashcams. Also the GPS is taking a lot of hot from the windshield. The Vantrue has a better form factor against heat but, is further from the windshield and that mount can not transfer too much heat to the dashcam. The Vantrue mount is a very poor idea but is good at least against heat.
Unfortunately for your Viofo. your windshield does not have that black dotted area on the windshield where to install the mount of the dashcams.
Speaking of flaws and black dotted area I consider was not a good idea to include that static films because some people with great opportunities to mount the camera on the black dotted area in a great location will use that static film on a clean area on the windshield and the whole setup is also looking ugly from outside.
I don't know if Kia has he same type of windshields like Volvo, which is creating heat issues to Viofo dashcams.