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Ddosik
User level: Level 1 (7 points)

iPhone 15 Pro displays random overheating warnings and switches to low refresh rate

Hello, I’ve encountered a bug on my iPhone 15 Pro (iOS 27) and wanted to report it and ask how to fix it. The issue is that, at random times—even when the phone is cold or not being used—it displays an overheating warning and prevents me from using the device. The only solutions are either a force restart or simply waiting anywhere from 10 seconds to a minute; after that, the iPhone resets its screen refresh rate. During use, before the warning appears, the phone switches to a low refresh rate for about 10 seconds and then locks itself (without showing the warning). If I unlock it and use it for another 10 seconds—even though the phone is cold—it locks the screen again; then, when I press the power button, it finally displays the high-temperature warning. This had never happened before; I’d never even seen a notification like that on this iPhone.


[Re-Titled by Moderator]

Original Title: Fake iPhone overheating

Posted on Sep 16, 2026 5:01 PM

11 replies

Jeff Donald
User level: Level 9 (64,078 points)

Sep 16, 2026 5:24 PM in response to Ddosik

You originally titled your post "fake iPhone." Is it a genuine Apple iPhone or a knockoff? If it's a genuine iPhone 15 Pro, you need to have Apple perform diagnostics on your iPhone. Diagnostics can be done in person at an Apple Retail Store or at an Apple Authorized Service Provider. You can also contact Apple Support and request remote diagnostics.


If you’re in the US, please call  1-800-MY-APPLE, or outside the US, consult the support articles below. In Canada, call 1-800-263-3394.


Contact Apple for support and service - Apple Support


Genius Bar Reservation and Apple Support Options - Apple


Explore Service Locations

lobsterghost1
User level: Level 10 (233,174 points)

Sep 16, 2026 5:54 PM in response to Ddosik

Ddosik wrote:
The iPhone is genuine, and the overheating warning is fake. I think it's an iOS 27 bug—after all, this didn't happen before.

If this was an iOS 27 bug, this forum would be overwhelmed with people saying the same thing on their phone, yet it's not.


There's a greater chance your battery is failing and the update put a strain on it, which pushed it over the edge. Open Settings > Battery > Battery Health - if as I suspect, the health is 80% or lower, the useful life of the battery has been spent and you need to pay Apple to replace the battery in your phone or trade it in on a new iPhone.


Either way, you need to schedule an appointment at your Apple Store Genius Bar for evaluation, options and pricing.

Jeff Donald
User level: Level 9 (64,078 points)

Sep 16, 2026 5:49 PM in response to Ddosik

It's certainly possible. I did see one other community member report a similar experience in the last couple of day after the upgrade was released. I'd reach out to Apple Support and see what they have to say and then report back with your findings. Pleas have Apple perform diagnostics on your iPhone. It can be done in person at an Apple Retail Store or at an Apple Authorized Service Provider. You can also contact Apple Support and request remote diagnostics.


If you’re in the US, please call  1-800-MY-APPLE, or outside the US, consult the support articles below. In Canada, call 1-800-263-3394.


Contact Apple for support and service - Apple Support


Genius Bar Reservation and Apple Support Options - Apple


Explore Service Locations

Ddosik Author
User level: Level 1 (7 points)

Sep 16, 2026 5:42 PM in response to Jeff Donald

The iPhone is genuine, and the overheating warning is fake. I think it's an iOS 27 bug—after all, this didn't happen before.

MilesIsCold
User level: Level 1 (8 points)

Sep 26, 2026 12:13 AM in response to Ddosik

Same for me (ip15pm) started right after the ios 27 update

Ddosik Author
User level: Level 1 (7 points)

Sep 16, 2026 9:38 PM in response to lobsterghost1

If this weren't an iOS 27 bug, it would have been present in previous versions of iOS as well. What's more, my battery health is at 98% with around 500 charge cycles; it’s an original battery, replaced at an Apple service center about six months ago.

Yahya15pro
User level: Level 1 (12 points)

Sep 16, 2026 9:42 PM in response to Ddosik

I am also observing the same issue. I installed iOS 27, and since the update, I have been receiving temperature alerts and experiencing intermittent network disconnections. I have already performed a hard reset, but the issue persists. The phone does not appear to be overheating, and its temperature feels normal.

vishalshakya7
User level: Level 1 (8 points)

Sep 23, 2026 11:20 AM in response to lobsterghost1

iPhone 15 Pro

iOS 27.0

Immediately after updating to iOS 27.0, the device frequently triggers the full-screen thermal lockout warning "Temperature: iPhone needs to cool down before you can use it" while physically cold to the touch in an air-conditioned room. This issue never occurred on iOS 26.

Frequent false thermal lockouts making the device unusable.


[Edited by Moderator]

Yahya15pro
User level: Level 1 (12 points)

Sep 28, 2026 4:29 AM in response to Ddosik

Has anyone found a fix for this issue yet? I continue to experience the same persistent problem, and the frequency of the message has increased. It seems to be a widespread issue affecting users following the update.

Iamhasnain10
User level: Level 1 (8 points)

Sep 21, 2026 5:41 PM in response to Ddosik

I am facing the same issue on my iPhone 15 Pro Max.

appleiphoneuser253
User level: Level 1 (8 points)

Oct 15, 2026 10:48 PM in response to Ddosik

Hi, I just updated to iOS 27 on my iPhone 15 pro and have the same issue. The thermal warning pops up even within 5 seconds of my alarm going off in the morning when the phone is cool.

Originally posted at discussions.apple.com/thread/256358556