Some owners of the new iPhone 15 Pro and Pro Max have claimed that their phones have been running a little hotter than earlier iPhones over the last week and a half. We found that the phones may get hot while working on our review, “sometimes to the point where they were uncomfortable to hold without a case,” and this has been confirmed by other reviewers and users.

The issue is real and significant enough that Apple issued an official response over the weekend, which was shared with MacRumors and other outlets. Apple claims that the primary cause at initially is “increased background activity” that occurs when consumers set up their new phones for the first time (something I’ve also experienced in older iPhones and iPads and is fairly common).

However, Apple claims that it has discovered “a bug in iOS 17 that is affecting some users” and that specific apps like as Uber, Instagram, and the game Asphalt 9: Legends are “overload[ing] the system” and causing heat issues. The company is working with the developers of those apps to build fixes that will be provided through the App Store.

Apple clearly states that the A17 Pro chip and the phone’s titanium frame are not to fault. Some speculate that one or both of these new elements (as well as the A17’s new 3 nm manufacturing process) were to blame for the heat issues. However, Apple appears to believe that it can address the most serious concerns with software, and the firm claims that the improvements will not harm the A17 Pro’s performance.

Whether due to heat or otherwise, Apple’s supply of new phones is still coming up to demand. If you order an iPhone 15 Pro today, you won’t have it until late October. It depends on the color and capacity of the iPhone 15 Pro Max, but most models won’t be available until mid-November.