This is strongly why I went away from dots four years back and have yet to come back into the fold, at least for carry. I trained it a lot initially, but when I failed to stay up on training the index, I lost it. Also, too many times I drew my carry pistol at occasional range sessions to find I was slow to acquire the dot at mid ranges, or that the optic had failed for whatever reason (RMR, usually battery issue), or the optic had lost zero in the carried much, shot little mode.
I am still not sold on dots for carry. I think they are an amazing training tool and when dialed with the shooter clearly increase performance.