IPhone 6 heat, battery drain, screen brightness flickering

My iPhone 6 has three issues. They are all connected in someway I believe. First my iPhone 6 gets rather hot with only moderate use, whenever it gets hot the battery will drain allot. For these too problems I have tried resetting, draining the battery to 0 and then charging to 100 and rebooting again, as well as disabling all battery draining technologies, such as location services. After all of these, the battery life is still worse than my older iPhone 5, using the same applications. The third problem is that the screen's brightness will randomly flick and drop. I have auto-brightness disabled, and my phone does it in all different kinds of circumstances. It will randomly drop when its cold or hot, when the brightness is at any setting, as well in any lighting of room. I have even done a side-by-side test of this between my iPhone 6 and my friends with the same background, after it randomly flickered, even with the brightness all the way up, it was darker than the other one. If you need any extra information just ask!

I had this same problem. Phone draining brand new, extremely fast. Usage and standby times in the battery usage meter have been nearly identical after 4 or 5 hours off the charger.
Went to Genius Bar two weeks ago, they noticed the battery drain in their test but said that nothing else looked unusual (battery fine, no major software issues, etc) and sent me on my way.
The problem continued, last weekend, did a full reset of the phone and set up as a new phone. Logged in using my AppleID at the setup and made sure to use the @icloud email address. I had previously used my first AppleID--a gmail account--from many years ago. The accounts were linked (gmail ID, linked to @icloud, @me, @mac address from later setups).
My problem was solved--went two days without charging, battery life was amazing, until today, when after the phone was acting odd, powered off then turned back on--battery drain began immediately and usage and standby levels are the same. I left the phone untouched for the last hour and "usage" went up and hour, as did stand-by.
For reference--no push email, fetch at 30 minutes, minimal location services on, background app refresh off, automatic update off, parallax off, etc. I have done every "trick" possible to improve battery life (some that make the phone useless).
iCloud seems to be the problem--can't figure out what part of iCloud is the culprit though.
Have another GB appointment tomorrow. Hopefully will get a more thorough diagnosis of the problem. Hopefully report back a solution.

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I had this same problem. Phone draining brand new, extremely fast. Usage and standby times in the battery usage meter have been nearly identical after 4 or 5 hours off the charger.
Went to Genius Bar two weeks ago, they noticed the battery drain in their test but said that nothing else looked unusual (battery fine, no major software issues, etc) and sent me on my way.
The problem continued, last weekend, did a full reset of the phone and set up as a new phone. Logged in using my AppleID at the setup and made sure to use the @icloud email address. I had previously used my first AppleID--a gmail account--from many years ago. The accounts were linked (gmail ID, linked to @icloud, @me, @mac address from later setups).
My problem was solved--went two days without charging, battery life was amazing, until today, when after the phone was acting odd, powered off then turned back on--battery drain began immediately and usage and standby levels are the same. I left the phone untouched for the last hour and "usage" went up and hour, as did stand-by.
For reference--no push email, fetch at 30 minutes, minimal location services on, background app refresh off, automatic update off, parallax off, etc. I have done every "trick" possible to improve battery life (some that make the phone useless).
iCloud seems to be the problem--can't figure out what part of iCloud is the culprit though.
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Read this guide - http://gizmodo.com/how-to-take-care-of-your-smartphone-battery-the-right-w-51321 7256
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Hi sjfwhite!
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Both my partner and I have iPhone 4S bought on the day they came out. We weren't having any problems till last month I noticed my phone had the "lock" icon in the center at the top of the home screen and any apps (this "lock" icon is NOT the rotation lock, it is the one that should normally only show up when the phone is locked). I could not get rid of it, no matter how many times I locked and unlocked my phone. When I went to go to the Settings app/page, it was blank. It was just a light grey background with tiny pinstripes (the usual background of the Settings page). I was also unsuccessful turning the phone off just using the lock/power button.
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Welcome to the Apple Support Communities!
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tanzim
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