It very odd isn’t it. On a number of occasions over the 18 months or so I have had this system, I’ve rebooted my router, or range extender, or mifi hotspot, many times, and every system always comes back up on its own. Most report that it does come back up on its own, but every now and again we get a post like this that says it won’t come back up after the internet re-appears.
If it were me, I would not be able to resist finding out what was going on, and in the absence of any other tools, or skill, I would probably just swap sync modules around, first deleting them, and then adding them back in, at the opposite sites, to find out if the problem followed the sync module or the router.
Of course it could be way too inconvenient to do that, dependent upon circumstances, distance, etc, and if that were the case I’d probably just buy another sync module, simply to find out. If it turned out the new one had the same behaviour, then I’d know it was something about the router, and could dig deeper. If it didn’t have the same behaviour, and the new one reconnected, then I could log a support ticket, with all the information needed to get the original faulty one replaced. Once replaced, I would keep the new one as a spare, for similar tests, or system expansion, etc.
Seriously, I’d even buy a sync module now, if I thought it would help, just to find out, but I can’t even replicate the problem in the first place, even with four sync modules in use. No matter what I turn off and back on again, it whatever order, I cannot get any of these four systems to fail to come back up on their own.
EDIT: Smart plug would work, as long as it wasn’t afflicted with the same issue as Blink, unable to reconnect automatically after a router reboot. If the problem is a function of something to do with the router, maybe it would have the same problem? Cheap and easy enough to find out though. I bet they’re only $10 or so for a smart plug/switch.