Problem refreshing data

I have a problem when I'm trying to program update in power BI.
Apparently it works correctly, I see Last correct update: 12/09/2016 21:00, but when I see the data I realise that is not correct, I can't see the
data of the last week so it's not refreshing correctly. I don't receive any mail with errors neither I see any error in my panel but it's not working,
why??
Any idea?
Maybe I'm overloading the MB allowed?? In that case how can I see it??
Thanks so much!!