17 of the devices all vanished from Kasa at the same time? Had you login your cloud account to remotely control them, or you control them at home? Was there any power outage happened?Try reconfigure...

Did you hard reset the bulb? Make sure you are using the latest version of Kasa. And since it stuck at "Device name" screen, maybe the device name you set is too complicated?

May I know which page do you want to open?

you can change the position of the USB disk on the router's web UI under Network map? never heard of it

what is the model number of your adapter? reinstall the driver? how about your other devices? do they stay connected to your wifi? you can try a different channel.

hold the reset thing till you can see the light flashes then let it go. if still no luck, maybe the hardware of this this unit is broken.