Hi Gary, it seems that you had it working before but now it's stopped. Hard to say what's going on but you could have a faulty network adapter? Does the OS recognise it? Is the correct adapter driver installed?. Sorry I'm not too familiar with Pi systems.
If you do get up and running again and still have signal issues then some other ways to improve it include, adding a range extender, switching to 5GHz bandwidth (if supported), disable any nearby devices possibly causing interference and/or get a better quality modem/router.
As for the NUCs, definitely go with a 8th Gen i5. It's what I use and in my opinion it's all you need. It handles all camera, telescope and observatory control software with ease via wifi. They're great at multitasking, and the hardware will have no issues with application upgrades for a while, so you won't need to buy a new one in 12 months time.
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