Probably best leave it to the wife then
It could be a whole number of things. Firstly I'd check your connection speed via speedtest.net
Find out much data your trying to stream, was it 1080p?
Switch everything off and back on again and retry. Sometimes ISP's limit your speeds after you've been on the same ip for a while, a reboot will reset all that.
Are you able to test connection to the router via cat 5 rather than wireless?