email the tp-link support. this problem is quite weird.

have you tried the new kasa app? tp-link release new APP version 2.0.0.

if you see that blanking amber and orange light, which means the plug lost connection to main Wi-Fi. You need to reconfigure them. Use the kasa app to add device. If kasa app can't find devices,...

no, the plug must be connected to internet for sunset/sunrise schedule to work.

Here is a compatible list: https://static.tp-link.com/USBServer_CompatibilityList_20170419.pdf

Check if your computer have Canon Printer driver. Not only need a printer server but also the driver is important