I'm running 2.4GHz and on-line. I saw someone, with the same failure mode, mention they only had there device for about 3 weeks as well. I'm beginning to wonder if they had a bad FW release for units in production during given window and that they have not found a way to write over it from the cloud, such that older units work fine, like mentioned by others, and we're just unlucky? My FW shows up as either null, or 1.0.7 when functioning. The device is always on line and I can manually dose even when receiving communication time outs, so I am able to communicate with the device over Wi-Fi all the time.
I also see there are later versions of FW than 1.0.7 but when the unit is communicating properly it shows FW 'up to date' even though it isn't current and therefore will not allow you to update. If I don't hear anything from CoralVue by the end of the week I'll contact them to send it to CoralVue for a FW update, which I can't do even with the 2 phone hotspot. Based on the cost of this thing I'm probably better off just tossing it, but it's hard not trying to get it working.
Another thought is the electronics components themselves, all manufacturers. in this case Kamore, have multiple suppliers for all components, maybe there is a HW compatibility issue during production in this time frame that they are not aware of?