Hello there,
I am experiencing OS freezing issue on lumia 625 since last few builds and it is not even resolved in WM 10586.71 . It happens very frequently at least 10 times in a day and it is very irritating for me to restart the device again and again. I have also tried downgrading to windows phone 8.1 using windows recovery tool and doing a clean upgrading to 10586.71 but no luck again this time.so I want developer team to look into this issue.Please escalate this feedback to windows developer team and get this resolved.