iPhone battery disconnecting when I watch YouTube [migrated]

I have an iPhone 4S which works perfectly fine in all aspects… except one. Whenever I'm watching a video on YouTube, especially one with movement (not so much on videos that show one background with a song playing), the Wi-Fi connection completely cuts out. I have to manually go to settings and reconnect. This can happen multiple times per video. I've watched videos on other sites and they didn't appear to have this problem, although it's worth noting that none of them use the same player as YouTube. This has happened ever since I got the phone and has really been annoying me. How do I stop this? Additional information: I always run the most recent update to IOS, so I'm currently on 9.3.

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