Yep. If you want to block the device completely, you can use access control under security. If you want to setup a time schedule , you can use parental control, choose white list but leave key word...

the printer not in the compatibility list.works on windows 7, may not compatible with 10.12 even has the 10.12 controller utility

ping to the WAN or the LAN? Have you tried to setup the bandwidth control?

You update the firmware via wifi or cable connection? All LAN ports works fire before the firmware update? If all broken, seems no way to pair them, suggest to replace it

what's the speed on other PC or mobile devices, will have the same issue? Have you tried to change another cable?

How far the HS200 away from the main router? Suggest to check the wifi signal and firmware on the kasa app Update to the latest firmware first