This issue is still occurring on my box too. It is far far better than it was originally, I don't know if that was due to drivers being upgraded or the fact I amended my timeshift settings.
I think I can go an entire evening without it freezing.

Just for info, the reason I adjusted my timeshift settings were I never had full confidence in it, and it didn't seem to work as smoothly as I would of liked or expected.
So now, timeshift is pretty much off, until I hit the pause button on live TV, and it will only start recording from there.