Update: April 13, 2021

OnePlus has rolled out a new OxygenOS update for the OnePlus 9 Pro which should fix the overheating issue. The OxygenOS v11.2.3.3 is now rolling out and as mentioned by OxygenOS Product Lead on the official OnePlus forums, the OTA update will optimize the overall device temperature and improve battery performance.

Here's the official statement,

We've identified the underlying reasons behind the reported increase in temperature and already begun pushing out OTA updates to optimize the overall device temperature and improve battery performance. So far, the initial feedback has been positive.

The first OTA (build number 11.2.3.3) was pushed out to our India users this week, and will be rolled out to North American and European devices by the end of this week. We’ll be following up with a second OTA to further improve the device temperature and battery in the coming weeks as well.

Thanks so much for sharing your feedback here on the forums. We’ll keep working hard to make even more improvements so you can have a reliable and enjoyable OnePlus experience.

Original Post (April 8, 2021)

The mightiest of the recently launched OnePlus 9 series is reportedly experiencing overheating issues. Users have been complaining about the same using the OnePlus community forum. The cause of this issue is unknown but according to several filed complaints, the issue persists particularly when using the camera app.

According to a forum thread that has now grown big, the OnePlus 9 Pro device overheats whenever users shoot 4K videos at 120fps. Some are even encountering the issue when shooting 4K videos at 60fps.

The overheating during 4K120 recording happened inside, with 22°C room temperature.

Another user reported,

My few hours old OnePlus 9 pro is heating at 44-45 degrees while charging. In normal usage, it reaches up to 41 degrees. Camera and all other apps are getting shut down giving a warning of overheating. Is it normal?

In fact, the issue is popping up when taking pictures.

#OnePlus9Pro
This is the last thing you wanna see when ur out taking images. Barely took 6 images in 5 minutes and this message popped up “Unable to take pictures as the phone’s temperature is too high” 🤬🤬 pic.twitter.com/j9dXfp7mIk

— Tecworkz (@tecworkz) April 3, 2021

The phone is even showing overheating warnings, making it apparent that the device is getting overheated. Looking at a number of complaints on the forum, it is clear that the issue is widely known and has expanded already.

Reportedly, many tech publications have reached out to OnePlus in order to know the status of the matter. OnePlus has reportedly acknowledged the issue and promised a future update to fix the issue.

OnePlus has seeded three updates to its newly launched OnePlus 9-series up until now. These updates have come in under 15 days of the launch of the phones. This suggests OnePlus is pretty active in fixing all sorts of issues; issues that even you and I do not know or have observed yet. We believe it might not take much time in releasing a fix for this overheating issue, considering the fact that the issue is attached to the camera app, and OnePlus has all praise for the new cameras of its OnePlus 9 series.

If you own the OnePlus 9 Pro device and have experienced overheating while shooting in 4K or just taking pictures then head over to this link and report the bug and let OnePlus know that more and more users are suffering from this issue and in dire need of a fix.