UPDATE: I reconnected one of the switches to my iPhone as a hotspot. The switch performed exactly as it should with no reboot issues. Setup was perfect through a different iPhone in the Kasa app. This was the first time I was able to complete the setup (including updating the firmware) where previously the switch would enter its rebooting phase before the setup could get past the device naming screen. This now points strongly to a network issue with the HS220 V2 and some other device or devices on my network.

@TP-Link 

Having same reset problem with 3 new HS220s V2.0 FW:1.0.5 bought from Amazon in late November and just able to install yesterday.  Noticed that ALL three continually reset (turning switched lights ON/OFF with amber and multiple green signal lights) when I turn ON my Samsung TV (Model UN55NU800D).  Have other HS200 and HS210 switches with no problems. Have two other Samsung TVs (Models: UN43NU6950 & UN50KU6300F) that DO NOT inflict the same issue on the HS220s.  Please advise regarding fix.

@Trifsterpsu 

Almost the identical issue and still can't resolve it.   I have two HS220 dimmers that were installed in December of 2020 and have worked without issue until Mid February when suddenly both dimmers became unresponsive.  The buttons on the dimmer do not work at all except for the restart button.   The dimmer is either stuck on or stuck off.  If you restart it, the buttons work for about 5 seconds.   In the app, the devices show as unreachable.  I have other Kasa devices on my network that are unaffected (2x HS300 and 3 HS105).  Most importantly, the reset button doesn't even work so you can't even disconnect them to start over.   I replaced one of the failed dimmers and it worked locally until I tried to add it to the app.  It joined the wifi network and then failed at the naming stage.  It then exhibited the same problems as the first two dimmers.   It's ridiculous to me that a failed wifi connection should cause the buttons on the front of the dimmer not to work.  

What I've tried.  

I've tried to factory reset the dimmers but the reset button does not seem to work.   I attempted to update the firmware on the dimmers by restarting them and then updating the firmware as they booted up.  The app reported that this worked but there is no way to confirm since the devices are unreachable most of the time in the app.  I've tried separating my wifi setup into 2G and 5G networks but that does not seem to correct the problem.   

Update:  After I posted the above. I figured out that if I completely shutdown my wifi the dimmers would revert to local usage.  Once they were in local mode, the buttons (including the reset) started to work.  So I reset the dimmers and re-enabled my wifi.   The dimmers work perfectly as local dimmers not connected to any wifi.  So now I'm left guessing what esoteric setting in my wifi setup is locking up these dimmers.  

Anyone have other suggestions before I scrap these dimmers?   

@gotliebk 

try to connect to a new WiFi network with zero other devices. Your WiFi guest network may work. I hotspotted my iPhone. Connect the switches as the only device to this new WiFi network. This is temporary. After they are setup and working update the firmware. reset again and connect to normal home WiFi network. Hopefully they stay working. 
 

if you are running a home bridge server, update the Kasa smart tp link plugin. 
 

Issue resolved finally!

I was too lazy to capture network packets so instead I started with just a new vlan for kasa devices with routing to all other networks. Having it on a different subnet totally fixed the issue! One thing I did was provision a new ssid with only 2.4ghs since it will be dedicated to kasa devices only!

perfect now I can continue installing and swapping all my switches in the house :)