Cannot 4 shot!

Every time I get a new isp or vpn I am able to 4 shot in halo, after a couple days I am back to 6 shotting people and dying quick, which is ridiculous.
My connections are fine so it might be from your end?
Please help this has been a long ongoing issue and is ruining the gameplay experience, for what in my opinion are one of the best games made, halo5/mcc.
Not only this but all my damage seems decreased when shooting and dying too quickly, not making this up you have to see it for yourselves,.
343 ??

343 Please fix this matter, it makes the game impossible.

Anyone??