I’ve got 6 green houses with two routers each. Each router connects to three other routers, half of them can connect directly to the sky connect. I So every device should connect to at least three routers or two routers and the sky connect. I do have some spare routers, but I can’t get them to reliably connect any more,
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I don’t suppose any of your routers are being manually powered off
They’re all USB type routers connected to mains wall outlets through old phone chargers or outlets with built in sockets. So they should be powered 24/7.
Everything that’s already on the mesh is rock solid. No faults or dropouts. It’s only new devices. I thought at first that I’d simply brought a bad device, but even when I brought replacements that were identical to ones I already had they dropped out as well.