The Register reports some users with a solid state disk are encountering issues with the Windows 10 Anniversary Update. It appears that if Windows 10 is stored on a SSD, but you also have a HDD with programs and data, the new operating system can exhibit issues with freezing. So far, there's no fix and Microsoft recommends a rollback, which apparently caused even bigger issues for some users:
Microsoft's advice has had mixed results.
Kjl1956 writing on the same answers site admitted to a successful rollback, but PaulQ_602, who detailed his machine as an Acer VN7 laptop with 256 SSD and a 1Tb HD, both using Bitlocker, hit a wall.
PaulQ_602w wrote: "I tried to roll back and it destroyed my system. Hung up in the process. It wouldn't boot again. I had to wipe the entire SSD and start over with a clean install of Win 10 (anniversary edition unfortunately). It was freezing again soon after, but I managed to go over an hour last night with no freezing then I had to leave it. I'm going to get back on it after work and see if it's freezing again.