Trouble viewing video (internet disconnects)

Hi,
When viewing any video on my laptop, at no particular time or moment, the video can go into slowmotion (playback and audio) and appear as though it's corrupted. When this occurs, tha laptops automaticalle looses conectivity with the internet. The wifi conection is still accesible from my tablet and/or mobile, but my laptop says that there is no conection. The only workaround this, is to restart the laptop. When restarted it works fine, until I start viewing some other video, and it all starts once again.