I'm not certain if this is a bug or if I should be making a suggestion thread.

[Edit: Moved to suggestions after talking to a guildmate who had the same thing happen. Seems this is not a bug, but it would certainly be nice.]

I know from experience that you get an alert/notification when a trinket or weapon slot upgrade, heat amplifier, or coin booster expires as I've used all of those.

Tonight I logged on to do my prestige mission for tonight, and didn't notice that I was using CE to use the elevator until I saw that my ME was depleted halfway through the mission.

I'm not intending to make a bitter whine thread that I lost some CE (as I've seen posted in the past by players) but it would certainly be nice to see the reminder that we get for the other upgrades for the elevator pass.
I wouldn't have even expected it, and certainlyly would have watched more carefully when it was coming up if I hadn't already had other upgrades expire and gotten an obvious notification...