ah driving me nuts, alot of the times i have just used stealth with 100% energy and a team player brushes past me with his shield on and my energy gets completely destroyed and i have no energy within an instant. Happens a fair bit when i stealth and sprint, i move 2 spaces and i'm depleted and no energy in this game = 1/2 hits and dead

Agreed same thing can happen from bumping cars or accidentally backing into fire

Taking any damage while Cloaked makes you lose all energy. Same thing when you start firing while Cloaked.

I don't know why bumping into a friendly would do that though.