I agree with Dashmellow's selections. Something which some people can't seem to grasp well is that
any mass-produced product, no matter who makes it, will have a small percentage of dud products reaching the consumers. Anybody can be the unlucky slob who gets one of those
Given the relative complexity and low cost of dashcams compared to professional-grade video recording equipment I'm pretty impressed with the better cams
All too often we see somebody who got a dud crying loudly that all those cams are crap of the worst kind and that the seller is a crook. Sometimes their problems are self-caused which they refuse to believe even when numerous people try to explain that to them. But sometimes their complaints are valid and then you begin to see others discovering the same issues and reporting that. You've got to sort through the difference yourself
One of my life rules applies here too: You don't get what you don't pay for. You want best reliability, then you've got to pay for that. Oddly, these two cams mentioned are far from the most expensive ones, and many of those more costly cams are far less reliable. Go figure
Just remember, these are cams meant for general consumer use. They are not meant for use where life or death could hang in the balance, nor are they even intended to be used by professional video recorders whose entire career may hang on getting one shot just right in the one chance they have to do it. Even as impressed as I am with my Mobius, I wouldn't stake my life or career on it. Being electronic it can completely fail at any time without warning, so it gets a back-up to increase my chances of having at least something no matter what it does. IMHO that is the best approach to reliability so that's what I recommend
Get a Mobius or SG9665GC (or both) and make sure it's not your only cam, then check and maintain them all as you go along knowing that there's not much more anyone could do at any price.
Crossed fingers and rabbit's foot are optional
Phil