( CNN ) -- The new version of Apple 's mobile operating system , iOS 7 , was released September 18 to mostly positive reviews . It was the biggest change to iOS since it was introduced six years ago , overhauled to add a slate of new features and a more streamlined , flat , abstract look . But nobody 's perfect , right ? It 's not unusual for new operating systems to have some glitches in their earliest days . Nobody 's talking about anything cataclysmic this time , like the Apple Maps fiasco on iOS 6 that led CEO Tim Cook to issue a rare apology -- and which some say led to the ouster of Apple senior vice president Scott Forstall . But a couple of weeks into its existence , iOS 7 has prompted a handful of complaints from users . Here are five of the most frequently heard , along with tips for how to fix , or at least bypass , them . iMessage failing . Apple says it 's aware of an issue that 's causing texts sent through its iMessage app not to go through for some users . On various Apple-oriented message boards , iOS 7 users were complaining that they 'd send a message which appeared to work fine , only to later see the dreaded red exclamation point that means it was n't actually sent . `` We are aware of an issue that affects a fraction of a percent of our iMessage users , and we will have a fix available in an upcoming software update , '' Apple said in a statement e-mailed to media outlets . `` In the meantime , we encourage any users having problems to reference our troubleshooting documents or contact AppleCare to help resolve their issue . We apologize for any inconvenience this causes impacted users . '' The fix ? Until the update rolls out , some users say they 've been able to get rid of the problem by turning their phone off and back on . Animation flu . Some folks say they 're already sick of iOS 7 . Literally . iPhone and iPad users , or at least a few of them , say they 're getting symptoms similar to motion sickness while looking at iOS 7 animations . On the new system , images zoom in and out when users switch between apps . As TIME explains , the brain gets unsettled when the eyes try to focus on images that do n't match up -- for example , when you 're on a rocking ship or moving car and trying to read a stationary item , like a book . The fix ? iOS 7 users can go to `` Settings , '' then `` General '' and then `` Accessibility . '' Click on `` Reduce Motion '' to make the zooming go away . Battery drain . This one has been mostly reported by users of older phones like the iPhone 4S . Simply , they say iOS 7 seems to drain their batteries faster than iOS 6 did . One factor may be that iOS 7 expands the ability to run apps in the background while focusing on another task . The fix ? Again , go to `` Settings '' and `` General , '' but then choose `` Background App Refresh . '' From there , you can choose which apps you 'll allow to run in the background and which you wo n't . There are also general battery-saving steps , like dimming your screen and making sure things like GPS and Bluetooth are switched off if you 're not using them . Certain apps log you out . This one might take care of itself over time . When Apple updates its operating system , apps that rely on parts of it ( like Camera ) must update as well . Until they do , they sometimes kick users out . On Apple message boards , users were mentioning apps like Snapchat and Mailbox as frequent offenders . The fix ? Some developers may have already tweaked their products , and other fixes are probably on the way . But if you 're still having problems , you can go to `` Settings , '' `` General '' and `` Background App Refresh '' again . Turn off any apps you 're having problems with . Lock screen bypass . This one has already been addressed in an iOS 7 update from Apple just days after the new operating system rolled out . For the first few days , iPhones and iPads apparently were vulnerable in one particular instance . If users were running the Camera app and had Control Center activated on their Lock screens , there were a few steps someone could take to unlock their phones . But the iOS 7.0.2 update , released on September 26 , `` fixes bugs that could allow someone to bypass the Lock screen passcode , '' according to Apple . Are you encountering issues with iOS 7 ? If so , have you found a way to fix them ? Let us know in the comments .
iMessage not working for some users of Apple 's new mobile system . Some also say they get motion sickness from animation on their iPads and iPhones . Apple has already fixed a Lock screen bypass . Comment: