Wyze plug goes on/off intermittently with no schedule set

I recently bought 2 Wyze plugs. Activated the first one about 3 weeks ago. It responds when using the manual on/off feature in the app, but it also goes on/off intermittently by itself. I just want to be able to control a lamp from the app. No schedule. Useless if it will not stay off when I turn it off and stay on when I turn it on. Help?