Oh yes, this happens to me all the time!

yesterday I was playing a game on the map hardhat, I was 1 kill away from my osprey gunner and I seen some person running towards me and it would not let me aim on the person, its like the person had a invisible barrier around him... pissed me off so much!

just another way to reaward the bad players...

I've seen it but it's usually associated with a server timeout at the end of the game.  I can only presume that my connection to the server isn't that great.  So I'm probably getting the positive side of lag comp (a rare occasion for me) and when my connection lapses in and out I can't hit anything.

I rememeber when this theory was put to Ghandi he replied something along the lines of the problem being caused by players leaving the match and new randoms joining during play ("hotjoins"). Its very annoying but it makes sense because if your pounding the other team their players will quit the match and consequently they will get replaced. Apparently this screws with the built in "equilising measures" that already plague the game.  Have a quick look at the scoreboard next time you feel this crap happening to see if new players have joined.

Edit- Maccabi do you reckon thats whats happening?

lol you guys are funny, there is no such thing as the game knowing how well your doing, and all of a sudden your terrible

if your not doing well all of a sudden, then you all of a sudden are not making good decisions, its not the game screwing you.. stop creating things that arent out there