Something that happened to me in April happened again yesterday - namely a RokuTV network adapter would "fail" somehow. What is worse though is that at that point the TV stops being useful as a TV because it starts rebooting itself every minute or two! It will restart without a message (or 30-sec freeze) and when it comes back, even if not going anywhere near network settings but change to one of the HDMI inputs and let it be, it will bomb again shortly.
When it saw that for the first time (4/22), i thought i had it nailed down to the process of enabling developer mode on RokuTV. I.e. it happened after i had to re-enable developer mode after some FW change and after rebooting, suddenly there was not network and spontaneous reboots ensued. I tried different things and no one single item seemed to work - but at the end after some combination of driver reset, adapter reset, power unplug, factory reset - it seemed fixed. But then i was able to get it in that MAC=00:00:00:00:00:00 state again - if memory serves, through enable dev.mode reboot - and that time i somehow reset the adapter by lesser means factory reset and let it be, thinking i'll do a write-up on this later. Which i didn't.
Fast forward 10 weeks and the same thing happened yesterday, except i was not enabling dev.mode but simply rebooting the player (while researching the curious case of screensaver that has no name) when this happened. Same symptoms (all-0 MAC, spontaneous reboots) and driver reset, adapter reset, factory reset did not solve it but when i added to that removing the power cable, the network adapter was back.
Here are some screen captures i took back in April (then firmware was 6.2.3341, now shows 6.2.3486):
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I don't know if that's more of a hardware or software issue - but the part where it keeps bombing when the adapter is "not present" - that's clearly a software issue. It should be doing "the next best thing" and work as a "dumb" TV if networks are down, not crash. It shouldn't be happening, any of this. A casual viewer is unlikely to have my bloodhound tenacity in tracking issues, taking photos, writing down and so on - they'd just pack it up and return (bonus: bad reviews).