Are you streaming or downloading the film first?
downloading first wont fix the problem itself but as there is no buffering it may be a work around, before selecting the film press the green button so the menu at top shows Recorder > player. this will download the film to your movies folder, once downloaded you can watch it via the file list button.
Ah, downloaded films via IPTV don't tend to have the info like the TV recordings do.
Do an update on the iptv player,there will be a green arrow at the bottom of the list,your box will then reboot,see if that helps