I had 3 Citi Dividend accounts and failed to set calendar reminders for period spend. 2015 was a terrible year for 5% categories so I did not use two of the cards. One had a targeted 5% offer for airfare that I used.
I just received notice that the two account were closed immediately. Similar happened to my wife last year with a forgotten Hilton card. In neither case was there any warning of impending closure.
To humor myself I called the Citi Prestige line. They attempted to re-opened the accounts but could only do so with a new hard credit inquiry. No thanks.
The next quarterly bonus includes drug stores so in a different era I would have been kicking myself.
So, if it happens to you, let it go, and move on.