You might consider returning it for a replacement, if you're able to (and if you can return the replacement should you need to - keep your options open).

Compared to some of the competition, Garmin is like buying the nicest house in a bad neighborhood. They have the best feature lists in their devices, but, as you've seen, they don't always work reliably. A lot of people feel like Garmin makes excellent products but has very shoddy quality control. Here's an example: using what should be the same hardware, Jarrett2 gets 2.5 hours out of his multiple VIRBs and you can't get more than 1.5 hours, even if you reboot the thing. Sounds like you have a dud unit. If it's the only thing out there that meets all your requirements and it's possible you'll get a replacement that actually works as it should, sounds like that's in your best interest.

I bought a Garmin Fenix 3 watch recently. I'm waiting for the retailer to get me a replacement because its GPS accuracy is unacceptably bad. Other people who own the watch report much better performance from theirs. QC strikes again!