Network connection

I’ve three Surface Pros: two 7+ running Windows 11 Pro and an older Pro 5 running Windows 10 Pro.  All fully up to date. All exhibit the same problem, even when placed next to each other and barely 2 metres from a wireless repeater that’s part of a TP-Link Deco mesh network. The problem is that randomly any one or two of them will claim there’s no internet connection while the other one or two are rock solid with a 90 plus score on my Orb app.  Then a random time later the disconnected device will find the network.  There’s no obvious pattern – sometimes the problem exhibits itself on a full cold start, sometimes on waking from sleep when the typecover had simply been closed.  Other devices such as a phone or Android tablet never show this so I conclude it’s something to do with the Surface tablets – but what is it and how can I fix it? Grateful for any suggestions.