Engineering BOffs drop the Medical Generator (if they have it) every time the skill has cooled down.
This is a Bug.
The behavior should be that they will drop the Medical Generator every time the skill has cooled down while in combat (ie. Red Alert) ... but NOT do so when not in combat.
The generators themselves "work" as far as granting the buffs that they're supposed to and everything ... they're just being deployed "too often" and under circumstances that the BOff AI "ought to know better" than to do.
If you have an Engineering BOff with the Medical Generator skill ... or HAD one with it and retrained them to something else (less annoying) ... please "sign" below so that the Devs can get some more accurate feedback as to how consistent (and annoying?) this situation is for this skill.