Mine work "fine", but it do look as if after a while it get into a argument with the memory card, and so i replace it even if i am not able to detect / test and find any errors with the memory card.
The card i have mainly used in it is the red & black trancend premium 400x cards, and others was moving away from that model for a reason.
But yeah there are always the chance of a off camera, with a issue others might see, or in my case with my SG9663DR camera a issue no one have ever seen before.
This is where the maker should step up, and in the case of my DR camera SG have also offered to replace it even though they sent it to me for free to test, so i turned that down as it is just wifi connection that do not work for me, everything else seem fine.
I know this is a couple of years old, but man -- I missed this thread entirely. I had the original "KxS", the K1S from Koonlung. From the start it had problem with the USB connectors. Once that was resolved('ish), the thing just started going wonky, overheating, missing frames (lots of frames), reboots, stupid low volume, etc.... I held onto it for 4yrs, just not even paying attention to it, I was so fed up and sold the car with it installed.
Now, this thread on the K2S (obvious "upgrade" of K1S) and besides USB connectors, exhibits nearly the same problems. The GUI is a bit different, but overall the exact same camera.
I think the K1S wasent that a motorcycle camera ?
But yeah the main unit look very much the same aside for button markings, the K1S was it also using USB C plugs ?
The K2S i have are also 2 different cameras, the slightly newer model have 2 similar IMX 291 sensor cameras.