iPad Pro will not stream videos properly, but other devices can.

Yesterday we got some new and better wifi installed. Ever since then, when I try to watch a video (on YouTube, Netflix or Play Video) the video will either not load and keep buffering or play for a bit then start buffering while having really bad quality. On other devices at home, like my phone, PC or my mom’s iPad Air 2, videos can be streamed without interruption in HD. I’ve tried restarting my iPad, reconnecting to the Wifi and even updating it but nothing works. Does anyone know what going on? Thanks in advance!