I didn't call tech support.
I have a lan scout and was able to verify all Ethernet cables were fine (I have to do this often as I make a lot of my cables and with the color conversion problems I have I constantly get the orange and brown wires switched)
I tried all four of the lan ports when the thing wasn't working and none worked, when the router is working they all work.
Antenna movement doesn't seem to do anything.
I've not moved the router since it's been working because it was a pain to get back going. I'm just now getting all my devices back connected, every echo, tablet, AP, etc. had to be reconfigured. On top of that banking and netflix and all those other sites what me to reverify my accounts.
Next time I'm out i'll grab a newer router then take this guy apart and find what's loose (swollen cap, bad trace, etc).
Wild thought - ever had a problem with magnets? The router was sitting behind my center speaker, but it'd been working for months so i orignally discounted the possibility.