This is a slight bug (Not a crash to desktop bug), the selected fire mode for overwatch doesn't save correctly across separate battles.
I.e At the end of one battle you might have a basic Assault Rifle on Full auto, in the next battle, if the same trooper still has an assault rifle, its initial overwatch has Full auto tick'ed, but it is in-fact still set on the universal default, snap shot.
Further more, ticking an already ticked box doesn't do anything, so to set the overwatch fire mode to Full auto again, you have to tick something else, and then tick full auto again.
