Forza Horizon 2 is a great game, but it’s also an open world game, and open world games tend to have glitches due to the enormous amount of variables involved. This time around the problem seems to originate from a conflict between the game’s features with the way the Xbox One itself works.
Reports are starting to pile up in several discussion environments on a glitch that causes the game to freeze entirely, at times with the road becoming invisible under the cars and the music looping. I can definitely confirm it myself, as it happened to my own game four times in the past day.
The only way to get out of the pinch seems to be a hard reset and full power cycle, since the console saves the state of the game, meaning that just going back to the home screen and then reopening the game will put you exactly in the same bugged spot.
The problem seems to be caused by how the Xbox One handles memory, slowly and gradually clogging it unless the unit is completely turned off instead of being put in stand-by. This presumably conflicts with streaming the environment of a game in which the players gets to move around very fast like in Forza Horizon 2, which is a task that requires a lot of efficiently flushed memory. The faster the player is allowed to move in a streaming open world, the harder it is on the console’s RAM.
Periodic full resets (done by unplugging the power cord for 30 seconds before turning the console on) will help avoiding the issue, and setting the Xbox One to “Energy Saving” mode (in the Power & Startup menu within the settings) instead of “Instant-on” will sacrifice start-up quickness, but should prevent the problem from appearing altogether.
Update: apparently many of those suffering from the bug are part of the preview update of the operating system, and the developers seem to think the two things are linked, as specified on NeoGaf, promising a fix soon.
We’re aware of an issue with the October preview beta dashboard update that’s causing these freezing/lockups for some users, a fix is incoming soon.