Repeated bug_type 211 UI/GPU crashes on iPhone 17 Pro Max – even after Express Replacement (possibly iOS related?)

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Repeated bug_type 211 UI/GPU crashes on iPhone 17 Pro Max – even after Express Replacement (possibly iOS related?)

Hi everyone,

I’m dealing with an unusual issue on my iPhone 17 Pro Max and I’m hoping someone here might have seen something similar.

My original device had a frame + display replacement after accidental damage.

After that repair, the phone started showing:

random lag

short 1-second black screen when closing apps

UI freezing or stuttering

slow animations

When checking the analytics logs, I repeatedly found: bug_type 211

From what I understand, this points to a UI/GPU reset or a display controller crash.

Because of this, Support approved an Express Replacement device.

I set up the replacement phone as completely new — no backup restored.

But after only a short time, the new device has already generated another bug_type 211 log, even without apps or data brought over from the old phone.

So now I’m wondering:

Could the replacement device also have a hardware issue?

Or could this possibly be an iOS-level bug affecting certain iPhone 17 Pro Max units?

Is anyone else seeing repeating bug_type 211 on iOS?

Both phones were on the latest iOS version, and the issue appears even with a clean setup.

Any insights or similar experiences would really help.

Thanks!

Posted on Feb 5, 2026 5:27 PM

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Answer 1

Feb 5, 2026 6:00 PM in response to mahir75

I’ve seen no other reports like yours, so it isn’t an iOS bug. It sounds like a hardware problem. There are probably several thousand bugs in iOS, as there are in any complex software, but iOS catches the vast majority of them, performs recovery, and reports it in the log so it can be addressed during future updates.

There is no point in looking through analytics; there is nothing you can learn from them without an iOS data dictionary, and that is only available to Apple employees working in development areas. And even they don’t actually look at logs; they process them with an app that generates a human readable report, because they don’t want to slog through thousands of lines of gibberish either.

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Answer 2

mahir75 Author

Level 1

4 points

Feb 5, 2026 6:19 PM in response to Lawrence Finch

Thanks for your response. I agree that it could be a hardware problem, but what makes my case unusual is that the issue appeared only after a repair, and then the Express Replacement device shows the exact same symptoms, including the same bug_type 211 logs, even after setting it up as a completely new iPhone with no backup restored.

What’s also interesting is that every single analytics file on both devices shows the exact same bug_type 211 entry, which makes the pattern very consistent. Because two separate devices show identical UI/GPU issues, I wanted to also consider the possibility of an iOS-level bug affecting certain units.

I’ve already submitted all the analytics logs to Apple through the Feedback Assistant so their engineering team can take a look.

I appreciate your insight.

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