I never had a problem with this until today but it is getting soooo annoying.

Worst part is that all the people I get grouped with have no clue about the problem so when half the opposing team is in their jumpy invincibility mode and the match is stretching longer and longer I'm the one being yelled at for giving up. There are only so many times I can drop someone down to under 10% health before suddenly every single action I make goes poof and their health shoots back up to full before I just /sit and wait for my 10 experience/marks.