Why?

Why does my DLC on Fallout 3 and Fallout 4 just randomly unistall itself? Why does this happen? I do everything the microsoft bots tell me to do, but down the road it happens again. You can dump 90+ hours into a character and then one day *boof* its gone,
the dlc you own isn't showing up and hour, a month, a day later. I own both games physically. Both come with all DLC. They are Game of the year edition and they both installed fully and properly. However, many, many, many, times I get on to play and it says
such and such dlc is missing. I hate it, and I think it is theft. I own the game! Where is it going to and why??? Why? Why does this theft happen? I contacted Microsoft (After doing everything they asked many times) and they woukd not tell me why. I am afraid
to own an xbox and have my personal information on it, if what I own can be taken away from me without explanation whenever. Again, I think this is theft and maybe my account is hacked because I never uninstalled anything. You all should watch your accounts
and be afraid because this is infuriating. And the only thing microsoft bots will tell you to do is factory reset your device and log out LA LA LA it accomplishes nothing and the problems persist.

:)