Issues on my iPhone 12 Pro after updating to iOS 18.3.1

Then you may have to consider wiping and restoring from your backup.

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

or

Restore your iPhone, iPad, or iPod to factory settings using a computer - Apple Support

The iOS 18.3.1 update itself is likely not cause of your issues as tens of millions of users have updated without any problems. Unfortunately in life sometimes things go off the rails for no reason. There may have been an existing glitch on your iPhone that caused the update to go south.

If you are not comfortable with restoring your device by yourself you could contact Apple Support or take the phone to an Apple Store or authorized Apple service provider for assistance.

Thanks, it helps!🤩

Jeff-Huang wrote:

Sorry to hear that.—iOS 18.3.1 might have bugs. Try:

1) Hard Reset (quickly press Volume Up, Volume Down, then hold Side button until Apple logo);

2) Disable unneeded Background App Refresh (Settings > General > Background App Refresh);

https://discussions.apple.com/content/attachment/51f84297-b5b5-483b-b9a2-4e811c948849

3)Check for updates(Settings > General > Software Update);

https://discussions.apple.com/content/attachment/b49eba7f-2b22-4259-b1d2-472c9b31d87b

4) Submit feedback to Apple . No clear timeline for a fix, but widespread issues often get patched in a few weeks. Good luck:)

[Edited by Moderator]

aubreyg wrote: "Also, my phone now overheats EVERY time I charge it. This has never happened before the update, all of the problems I am experiencing are absolutely due to the software update, as every single one of them started happening immediately after the update and never before."

aubreyg ~ Your iPhone 12 Pro Max could be 4½ years old and the long process of applying an iOS update to an iPhone with a weak, aging battery can be the proverbial "straw that broke the camel's back." Also, overheating whilst charging is often a sign of a battery issue. So...

Does your iPhone 12 Pro Max still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Wiping IOS 18.3.1 and reinstalling does not fix the issues I’ve experienced. Wiping ipadOS 18.3.1 and restoring does not cure either. Installing IOS 18.4 and ipadOS 18.4 betas cures the problems I’ve experienced. Draw whatever inferences you’d like.

Mandar0912 wrote: "Yes my iPhone 12 is still running the original battery however the battery status has been showing “Service” for a while now which is basically when it falls below 79% of charge holding capacity"

Mandar ~ Although you haven't stated the battery's maximum capacity, the "Service" status indicates that the weak, aging battery needs to be replaced. And consider replacing it promptly — as your iPhone can be permanently 'bricked' if the battery completely fails during the next iOS update.

iPhone Battery Service

About genuine iPhone batteries

Repair Provider Verification

(Articles found by searching Apple's Knowledge Base.)

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1123- wrote: "It is an i phone 11 and it started this after it updated to iOS 18.3.1"

1123- ~ Your iPhone 11 could be 5½ years old and the long process of applying an iOS update to an iPhone with a weak, aging battery can be the proverbial "straw that broke the camel's back." (A weak battery wiil not supply sufficient power to the iPhone's antenna to maintain the connection with cell tower signals.) So...

Does your iPhone 11 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Since installing the 18.3.1 update to my iPhone 16 Pro and to my iPad Pro Gen 3, I’ve been experiencing an array of strange issues. These include random application freezes, refusal to charge (plugging into known working cables and power supplies), map overlays not showing up. In each case, the problems resolve after shutting down the device and rebooting. The only common factor in both the IOS 18.3.1 and iPad OS 18.3.1 is length of time running. I normally keep my devices alive 24/7. If I’m not using them, they are in sleep mode or on a charger. I only rarely restart them except after an update or after a rogue application hangs. These instances are becoming more frequent the longer the update is out. The non-charging is clearly an Apple issue, not a hardware issue since it occurs on two different devices of different generations purchased at different times and running perfectly before the update. The map issue is an Apple issue since it again occurs with different devices. The freezing can occur with just about any random application and more randomly - I.e. anytime.

i know several other people experiencing similar weird issues, and others.

it is hard to report these as bugs as there are no diagnostics associated.

Ur phone data has a bug u picked up on a website , phishing email or link u clicked on w text. That kernel can stay w the phone since u granted it access. You would more than likely have to upload all to I cloud and reset the entire phone to solve the problem .

Try a network reset.

Make sure you report the issues on the feedback page. Theres even another page on the support where everyones been talking about their issues with ios 18.3.1 Click here to see

Try a network reset.

Mandar0912 wrote: "...my 4 year old IPhone 12. After updating it to iOS update 18.3.1 the phone has stopped charging when connected through brick and lightening cable..."

Mandar ~ The long process of applying an iOS update to an old iPhone with a weak, aging battery can be the proverbial "straw that broke the camel's back." So...

Does your iPhone 12 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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This info is helpful and is a confirmation of my experience. Whatever you do iOS 18.3.1 can’t be fixed.

Beta 18.4 could be the solution. It would be good to share feedback on this.