Since some of the plugs are able to reconnect automatically after router support, please swap the locations of the plugs to see if the problem happens on the same plug or same location. Besides, you could also try to change the 2.4G WiFi settings of your router, like WiFi channel, channel width etc., make sure those plugs are connected to router WiFi instead of extender. Hope it helps! and have a nice day!

@Tho-Mas try setting a static IP address for the HS10 in your router's wifi settings. Look under DHCP Server settings (or similar.)

 

It's fixed mine failing to reconnect.