yeah well dying in a field while doing stuff that is related too battle can still be like a real death but just the source is wrong. someone might of actually killed you (like that team mate) but it registers it wrong.
for me those where moments where i just dismissed it. but a lot of times it happend while inside my own team buildings while no possible link to battle was present at the time. no enemies in the base or tank fire that can bash in or anything. just standing near a terminal and suddenly boom death .
but good to know i am not the only one who get's the random suicide messages