When you say "broadband all working", is that on your 360 or other devices? All you've described is symptomatic of a TV box without a working 'net connection. Can you view OnDemand programmes or use streaming platforms ok? That also uses the 'net.
Following Settings > Network > Diagnostics will let you check your 360's internet connection.
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Yes, all working, diagnostic check all good, streaming services fine etc.
The TV boxes are just running very slow. Sometimes you click on a film, and it may take 15 seconds for the preview/desciption screen to come up. As I say, many icons are just showing as the black movie clapboard icon.
Are there any particular sections within Box Sets & Movies where this occurs?
I'm also on version 4.31 and have just tried to replicate your issues both wirelessly and connected with an ethernet cable and the only issue I had was once under Categories > Animation (619 titles) the screen froze so I gave my remote a quick waggle and it responded normally.
I saw no evidence of the picture icons failing to load, or showing the black movie clapboard icon, or having to wait for the preview/description screen to appear.
Thinking back around 6 weeks ago I did notice the black movie icons on some of the titles and I just rebooted my hub and 360 and when checking again they were working correctly again.
It's possible that your problem is area specific (I'm in Teesside) although I haven't seen other posts with this issue.
So if I go into Box Sets and Movies - sometimes the title panels "Family, Romance, Superheroes etc" will not load, so be a blank box, then going into a category the movie icons will be black at random - and I have just realised that at times when I am scrolling channels on the EPG the logos are sometimes missing and the channel name is just in standard font.
Basically images at random are not loading across the whole piece.