The connection may be over cellular so to make it play they drop the rate. They are Google. Some folk write it's Samsung but the YouTube app, site and OS is all Google. be sure you ask the right company.
so my galaxy s4mini with 4.2.2 android can only watch 360p ive tried checking youtube settings but without luck ive also reinstalled it but didnt really work
i got the i 9195 galaxy s4 mini