Well, the freezes you are describing are not but merely little-colder-than-warm issues.
In my broken H2O (I still have it, still out-of-stock in Mediamarkt, or at least, in the Mediamarkt store by my house), when it got frozen, sleep/wake up cycle didn't worked anymore (through coversleep or through brief power button pressing), neither normal power-off (1-2 second power button action).