IPhone 6s Plus being glitchy?

I have had the 6s plus for about 2 months now and its been working fine but now ever since yesterday night its been acting real glitchy. Earlier in the day yesterday i was listening to music and both earbuds were working fine but then later yesterday night when i went to listen to music the left earbud sounded louder then the right and the right just sounded low and muffeled at first I thought maybe it was the earphones but not i'm convinced that it might be the phone Because all night my phone has been lagging i open a app and then it bounces me out of the app the screen goes black and then it just brings me back to my home screen and the same when i try to listen to apple music its quits the song out as well i tried downloading a game last night on it and it wouldn't go. I have reset it multiple times and nothing seems to work. I have the sprint insurance plus but I don't know if that covers for me to get a new phone just Because its being glitchy. Any suggestions?

Make sure you close apps you arent using. You can't just leave a 25 things open.

Do a reset and try different headphones. Highly unlikely you need a new one. Those cheapo free earbuds are not very robust.

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