Formuler Z Alpha problems

I recently bought the above box and quite often channels go black for for 30 mins or so, I have no idea what's causing it, sometimes if I leave it on a channel black it comes on after 15 mins or so but no joy at the moment.

Supplier said to reload portal, I'm not 100% sure how to do this, I think it is go to connections then you have portals option to add portal and next to it is one I am connected to, if I click on this can either disconnect or edit?
 
Nah nothing else works apart from the football I was watching, freeview, kids, movies all back until I switch back to football. Not sure if problem with my box or the service, I have a v.fast internet connection?
 
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