Pausing programme jumps back

[MartinV]

I'm currently watching London's Burning from the first season, but if I pause the program in any episode (I'm now on season 3) the episode will automatically jump back to around the 11-15 minute  mark. 

The show is on U&Drama and I am watching it directly from sky glass (Not the App). I don't know if this is a program specific issue or a channel specific issue as I don't normally watch programs on these U channels

[MartinV]

It also doesn't do it every time I haven't really worked out When it happens to be able to replicate it as sometimes it pauses without issue