The P100s are shown as connected to the Tapo app when the telephone is connected to my Wifi. If I'm traveling and access the Tapo-app, all P100 plugs are shown as disconnected. I have 4 cameras and 4 Tapo P115 which all works fine and are accessible when I'm traveling. 

I noticed the issue the last year, but have been waiting for a firmware update to fix it. The issue persist and is only related to the TP-link Tapo P100 smart plugs.