are you using nowtv from your tv or a set top box/stick, or online?
if tv app, suggest deleting the app and reinstalling then retry.
the others, only advice I could offer is power off and start up again.
And here we go again NowTV/Sky....the above error is reoccurring, also for myself again and @Brendan444 per thread.
NOWTV/SKY - Please, please, please resolve this continual annoyance before users loose confidence and cancel subscription!
I'm also becoming exasperated by this constant error in the NOW TV player. If you want to watch more than one episode of a series, it's very irritating!
This seems to be a fairly new bug; I don't recall having the problem six months ago.
Please resolve this issue NOW TV. Eventually, people will get fed up and not renew their passes
Samsung’s advice is to switch the TV off at the mains, press the power button on the set to completely drain it down, wait 2 minutes, and then power it up again.
This worked for us in these circumstances.