@Solla-topee yes all other devices and my modem and router are working fine. No power outage. Was in the process of relinking this one new switch when all of them suddenly went offline. I was in the kasa app. Not sure how that could have happened though. They all just reset at once except for 4 of them. All got booted off Google Home as well. 
 

And yes I've tried restarting a few of the switches but all of them are offline and will need to be relinked and set up again. 

POTENTIAL SOLUTION Hello, I recently had the same issue. I had 4 smart dimmers (HS220) and a power switch (HS300) that started to give me a lot of problems. They were never "available" on the app and constantly looking for the connection, blinking green. Basically they could not be used. I looked quite a bit online and I found several posts here on the forum with similar problems (I posted this in a couple of different threads to reach more people). The common solution I found was to update the firmware to the beta version provided, using the tool linked in those pages. Unfortunately for me the upgrade never worked and I was stucked with the situation. After playing around a lot with both the devices and the network, the conclusion was the problem was the network and not the devices. Playing more (wifi analyzers, static IPs, optimal channels, etc.)  eventually led me to the solution (for me at least). I realized that my phone was causing the problem (Samsung S20). When I moved my phone to the 5Ghz only (leaving all the Kasa devices on the 2.4Ghz), all the devices connected quickly and worked perfectly. Then my wife got home, and as soon as she got in, the switches started to flash the green light. I moved her phone to the 5Ghz network too, but the problem remained. Then I noticed on her phone (iphone) that under the connection settings, there is an option for "private (MAC) address" selected. Deactivating that option, restored all the devices to a perfect working conditions. Sorry for the long story, but I wanted to share with other a simple potential solution that doesn't involve flashing new (beta) firmware. I don't know why this trick makes them working properly, but it does. I woulf like to ask peoplento try and let us know. Thanks SOLUTION: - keep all the phones on the 5Ghz network (with different SSID) - on iPhones, deselect the "provate address" option under the wifi settings