why?

so i`m not the only person to have this problem where I had my stuff deleted, as in cars, progress etc. the thing is I cant enjoy being in a private lobby were every time im racing about half way in I get “disconnected” and its very annoying where im losing money xp and im losing my fun experience its very annoying and you guys need to do something about it, it is a repeating problem, because of it a lot of people are not liking forza any more, you need to fix it!!