When the phone misbehaves
Apps that close themselves, batteries that empty by lunchtime, and phones that have got slow.
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An app keeps closing by itself
It opens, shows a white screen, and drops you back to the home screen. Work through it in this order.
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Your battery is draining too fast
Find the app responsible before you change any settings, because the usual advice fixes nothing.
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Your phone has got slow
What actually causes it, and why cleaner apps make it worse rather than better.
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Should you install that system update?
Usually yes, and here is when to wait, plus what to do before you tap it.