I changed the settings of my WIFI at home since my Docker was starting to takes address in the same range as the IOT VLAN network. Moved from 192.168.110.X to 10.110.110.X, everything went well and devices took the new addresses correctly.

The IOT VLAN has access to Internet but no access to the other VLAN. However my HOME VLAN has full access to ALL VLANS so it should not be an issue. I can always ping the KASA devices and they respond accordingly.

Everything was working well until I realized that my HS200, HS210, HS220 are all losing connectivity to the tplink cloud after 5-10 minutes. 

I also have two PLUGS HS103 and they are working well without losing connectivity in the same IOT VLANS as my disconnecting WALL switches.

------ UPDATE ------

Just noticed something worth telling you: I tried cutting internet access just for the heck of it. Everything was almost working except three HS220 of 4. Those not working are v2 on fw 1.0.8 which has not been updated. v3 is still working without internet access. Funny things, when I put it back on (the Internet) everything seems stable up and running (switches stays up, accessible).

------ UPDATE 2 ------

Three hours later, everything still working :D

------ UPDATE 3 -------

Sorry, the UPDATE 2 was not working. The three HS220 was still not functioning even if they were appearing online. As soon as I tried to turn ON / OFF remotely, they became unavailable and are still like thatl. I have to reset them if I want some functionality. Maybe it was the latest firmware update, I did an update on them couple days ago.