I first encountered the speed glitch about 8 weeks ago and sorted it by hard restarting my X1 however it's happening all the time since last patch and seems to be getting worse. Over the last 2 days it's occurred 6 times and I've hard restarted 5 times (gave up in disgust and turned machine off the last time!) and seems to be roughly every 4 games. I've looked into it and this problem is very common and has been well reported since release yet there hasn't been a patch or even a known cause. Can anyone shed any light on this because my game is more or less unplayable now because of it.