I am getting this check back cover message constantly, something like ten times a day. I get it when I end calls, I get it when I turn the screen on and it has been off for a long time, sometimes I even get it when I close apps. What a complete pain in the azz. Seems completely random.
Being an AT&T model I am not seeing a checkbox anywhere to not show this again.
I do have the wireless charging cover (genuine) which starts and stops quite a bit once fully charged, seems normal to me. Unfortunately it does make the puka sounds all night, I had to use macrodroid to cut that out.