Ive had some problems today, I was climbing a ladder in Seatown and next thing I know Im on the ground running into a wall. It happened a couple of times over a couple of maps. Im really not sure what it was, but luckily for me it stopped.
this happens when there is a bad connection OR a bad connection to the host.
Signs are dropping thru the map floor, walking thru walls, grenades not actually going off, etc.
If its consistent then it might be your ISP having issues OR your Xbox acting up OR you in home network being flooded.