Alickx wrote

forced a new IP address on the plug and it was OK, updated firmware and has been OK for a week

How did you force the new IP address.  I'll give that a try if I haven't already accidently done so.

@Dukeshop Just returned to Amazon for replacement. All my other plugs are working. The one that quit working just wouldn't connect to the network anymore. I tried everything. All the other plugs were working fine. Something must have just fizzed out...

@fuzzmanks 

I wanted to update my own post.  Over a year ago, I solved the problem pretty quick after I posted by dilemma above.  Unfortunately, I don't remember exactly what I did.  It wasn't a defective device.  I still have it in use doing the same thing as before with no troubles. I think what I did was reset the device.  Not just remove it from the app and add it back in. That was also in the time period that I was starting to have problems with my modem/router.

@Dukeshop Smart plug blinks orange and green but will not connect to anything. Website and app are useless

@Dukeshop I've had tp-link plugs for several years now and they are rock solid. We have a whole bunch of them around the house and two outdoor plugs for deck and patio lights. Just within the past week or so, multiple of them have been stopping working. I tried resetting and re-adding them to the app with no success. I'm annoyed, but recall an old tp-link router that just died out of the blue years ago. Now I have an updated eero wifi 6 mesh network that is rock solid and has been for a long time. No plug is anything even close to 30 feet away from an access point. I'm quite disappointed. If this doesn't resolve, I'm weighing the option of ditching all my tp-link stuff and getting something that includes Homekit support as well as Google and Alexa (we have devices for all three).

@Berdwa - If you have tried what was mentioned above (resetting the plug) be sure and force a new IP address that your modem/router gives to the plug.  I'm pretty sure that is what fixed my issue I posted about above.  The easiest way would be to unplug the power to your modem and router for awhile. It might only take a minute of no power, but if you can spare more (and hour or even overnight) that might what it takes.