brake light warning when heel-toeing?

For some strange reason, my "brake light" warning light comes up when I am aggressively braking or heel-toeing into a corner. Suggesting I need to replace a brake light bulb. It goes off maybe 15 minutes later. I've checked the actual rear brake lights and they work even though the warning light indicates they are not working right.
Any ideas of whats going on? Some weird electrical short, wires crossing?

it may be a defective bulb or make sure all are in tightly. check the socket tips of the bulb make sure they are not deformed. I had a bulb it worked but it would come on time to time i checked bulb was ok but the tip were it touches the metel contact was deformed i replaced it with new bulb problem was solved

I have a 93 325is that does the same thing. Ive changed the bulbs with no help. It seems I have a floating electrical problem. Sometimes my taillight warning goes off and other times it says to check coolant level, which is ok. Other times my drivers window wont drop when opening the door. If one works, then I get a warning for another. I did notice that I have a little corosion on the lowest portion of my taillight assembly wher the bulb plug in, but it doesnt seem like much. I need some help too