New coding language also is probably causing trouble for programmers as they "get up to speed," Levy said.
"It just goes to show how hard it is to test everything before it's sent out into the wild," Levy said. As with previous software releases, Apple will make fixes to its iOS 8 software in the weeks and months ahead, Levy said.
Trudy Muller, a spokeswoman for Apple, declined to comment.
Apple's iOS software powers the iPhone, iPad and iPod Touch. Since the latest version became available to download last week, 46 per cent of devices connecting to the company's App Store are running the latest version, according to Apple's website.
The software crashes are among several hiccups Apple has experienced with iOS 8 since its release. The Cupertino, California-based company also delayed the rollout of its fitness-tracking software, HealthKit, after it discovered flaws. Customers also have complained about how much memory is needed to download iOS 8, requiring people to delete photos, videos and apps from their phones to make room for the new system.
Read also:
• Apple, Google lock themselves out of own gadgets
• Is the iOS 8 update too big for your iPhone?
Still, the software snafus haven't been enough to discourage iPhone buyers. Apple on Monday said it sold a record of more than 10 million of its two new iPhones, which come with iOS 8 built in, in the smartphones' debut weekend. The company said it could have sold more if not for supply limitations.
- Bloomberg