The same thing is happening with mine. it will jump back 30mins and you have to fast forward to the last point and if you rewind just a little bit even 30 secs, It will keep counting back to 30 mins even without realising it and the whole thing will start happening again. I hope this issue will be sorted soon.
Same scenario here too after the latest update, it's like continually watching Groundhog Day being played out with endless replays of everything.
Mistakes happen and I guess we get that, but the sound of silence from the NowTV mob for at least an explanation of the possible cause is simply not good enough to it's paying customers.
Perhaps all their techies have been headhunted to Intel, in their hour of need.
I've given up on the NowTv box. Got it to replace an ailing Sky HD box, and wasn't keen to go over to Sky Q at £80.00 per month.
The whole point of the NowTV box, for me, was to be able to watch the Freeview channels, with the occasional top-up for Sport and Movies, but can do without them if pushed. Affordable, with the benefit of the pause/rewind etc functionality.
But now impossible to watch TV with it jumping all over the place.
As of yesterday, I now have a FreeViewPlay box. Used some of the money I have saved from not having Sky TV for the last 6 months. And the bonus is that I can record from it.