HS110 is connected but can't be controlled by Google or Alexa or the Kasa Android app
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It has become increasingly unreliable lately. It appears to be connected to WiFi (the indicator is solid green) but nothing can control it and the Kasa app can't reach it. It says "Device Unreachable" and that it may be powered off (it's not) or out of range (it's not). I've reconnected it twice today, and whilst the plug's lights indicate that all is well (it starts off being orange/green and then, once connected to my network, is solid green) nothing can reach it. I've got other smart plugs (not TP Link) that are working fine. Is there a way to completely reset the plug?
(I couldn't complete the firmware version because, of course, I can't connect to the plug. The hardware version is, I assume, V1 because it says on the back of the plug "Ver: 1.0".)
@Solla-topee Thanks for all the suggestions! 
I plugged it in again to suggest what you tried, and this time the app could see it! Nothing else had changed - it was still solid green, still on the same network. If it happens again, I'll try some of your suggestions. I know now at least that the firmware is definitely up to date.