I avoided downloading the iOS update for a long time but iMessage stopped working last week and kept sending as texts so I downloaded the blasted thing. Since then, the Internet keeps crashing and it takes a long time to upload webpages. But most importantly, the battery is draining really rapidly as in it'll be 100 percent then go down to 89 in just 30 minutes. Is there any way I can repair this without upgrading? I'm not due for an upgrade for a long time

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