I agree it’s idiotic advice. Google iOS “7.1 battery drain” and you’ll see several articles about it being the most notable addition with the upgrade. Our phones have all been affected. My iPhone 5 most notably. It’s gone from 24 hrs on a charge to less than 6.
A hard reset is usually the fix all, and it it simple, and quick. Restore is a PITA and time consuming, and unless you are restoring to a previous iOS will probably not fix the issue.
I have a Iphone 4, it wants to update soft ware, It can’t, I have all my music and photos on it. And they are not coming off. AT&T can’t solve the problem. Phone works fine, no scratches on face plate.
Samsung Gal 3 is big battery drainer, get task killer, but you have to task kill every time you use the phone. Down side of it.