Are other users getting a problem with rewinding live TV since the latest update?
Rewinding at 2x, 4x etc sort of works, but it's very unresponsive and often rewinds further that I want.
But the 'jump back 15 seconds' jumps back a few seconds but won't go back any further.
Is this on all channels or just Freeview channels or just internet channels?
Have you tried power-cycling the box?