Black screen loading portal


I’ve two subs, my reliable one and a cheap one that’s good for boxsets...
lately it’s been freezing up so updated software on the box to see if that would help.
Now after a few days since however when I try and load my reliable sub I click to load and the screen just goes black. I can access menu so it’s not frozen just doesn’t load portal.
I can however load my other secondary portal which is weird.
Friends and family use the same primary sub and aren’t having this problem...

Any suggestions?