Apple Inc. (AAPL) - Get Report  has touted many of the new features of its latest iPhone and iPad software, iOS 11, but as usual, not everyone's happy with it.

Users have complained that iOS 11 is draining their phone's battery life, causing apps to crash and is making features such as Bluetooth, WiFi and Touch ID work improperly. Other email applications like Outlook and Exchange were completely unable to send messages upon release. Fortunately, Apple issued a software update, iOS 11.0.1, that resolves any issues related to Outlook or Exchange, but many issues still remain. 

iPhone owners have been posting on Twitter, Reddit and in Apple forums about the issues for several days. One user posted on Reddit that their phone has frozen "10+ times a day," while another person tweeted that iOS 11 has slowed their phone down. A quick tour of the iPhone forums on Apple's website showed posts from users complaining about iOS 11, with some saying they'd switch back to iOS 10.3. Many of the users appear to be owners of iPhone 6 and 7 models. 

Apple's iOS updates usually cause some minor issues when they first roll out, as some apps struggle to get up to speed with the new software, and glitches are worked out in subsequent updates. Indeed, similar battery draining issues were reported with iOS 10. 

But it seems that this particular issue may not be unfounded. Mobile security company Wandera compared the performance of 50,000 moderate to heavy iPhone and iPad users operating iOS 10 and iOS 11. The firm found that fully charged devices running iOS 11 only took 96 minutes to deplete their battery, while iOS 10 devices lasted for 240 minutes. 

So what should you do to save your iPhone's battery life? Some users might think that swiping up to force quit open apps will save their phone's battery, but that myth has been debunked by many, including Apple's head of software development, Craig Federighi. 

Instead, start by checking which apps are running processes in the background. To do that, go to General and then Background App Refresh. From there, users can turn off the feature entirely, or deselect individual apps. Otherwise, you can preserve a phone's battery by turning off all location services, or turning it off for particular apps. This can be accessed under Settings, Privacy and then Location Services. 

More bug fixes will likely be issued when Apple releases iOS 11.1, which is currently available in a beta version, but until then, as with most new iOS versions, update with caution, and protect any unsaved data. 

Even with these glitches, there's still lots to be excited about with iOS 11. The new software brings updates to the iPhone's control center and notifications, and also introduces ARKit, Apple's augmented reality platform for developers that promises to change how many apps run. For the iPad, Apple adds new, useful features like the Files app, as well as multitasking capabilities such as drag and drop.

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