Big problem with my gow 4

About a month ago I started to experience a problem that I did not understand at the beginning (and I still do not), being in a game, whether it’s even, fast or in special events, after spending a while playing, I suddenly came out a small symbol in the lower right part (a diamond with a lightning bolt), after a few seconds it takes me out of the game and I put a message: “Error, you were returned to the main menu, you were expelled from the game.”, My friends they told me it was because of my connection, so I hired a better internet package and connected my xbox cable to the modem, however, the problem still continues and I do not know what to do. Please help.