Issues with ios 8.2 wifi

Hello everyone i am having an issue on my iPhone 6 Plus.

Whilst watching any video on WiFi, such as YouTube or Facebook etc it seems the video will stop and go into an endless buffer, in which the only way to fix is slide up and go on the control center, disable and re-enable WiFi and it will work. this will solve the issue by continuing the video and giving an error which results in me refreshing the video. also on apps such as clash of clans the WiFi drops and everything i do is not saved or an endless reconnecting icon pops up. i've seen people with other situations but they just reset there iPhone's but i don't want to do that.

Thanks to anyone in advance who can answer this issue!