Sorry, should have said that I reply to this topic:
https://community.flic.io/topic/14934/lost-flic-configuration-today
Tried it several times now and I can reproduce it with two different buttons (no "flic singles") on the new iPad Pro 10,5", on an iPhoneSE and on an iPhone6 all running iOS 10.3.2. Dunno if it helps but the buttons were bought from Amazon and are black and green. In my flic account settings stands "2.2.9".
Also the app always forgets my email (and password) what really sucks:-(
Any help appreciated,
Bingo