I've abandoned the 56 and downgraded to the 1.2.54 again.
Was just getting too many lock-ups.
These appear to be mostly I/O related.
A lot of them while watching recordings. Where the .54 will give bad pictures, the .56 just stops responding. The only thing that is left sometimes is SSH access, and what's weird, that even though it doesn't react to the front panel, nor the remote, the system is not loaded and still plenty idle. Fast forward triggers it faster, but the .56 screws up in plain play as well.