Many iPhone and iPad users have found Apple’s latest iOS update, which was released this week, not as easy to install as it has been in the past.
The biggest problem for most is the sheer size of iOS 8, which has led to people needing to delete apps, photos, music, videos and other files to free up the 5GB or so of space for the update.
The iOS 8 update has also caused a few glitches for older devices such as the iPhone 4S or the iPad 2, which has been blamed on the older devices not having the performance power of the newer models.
Several apps do not work with iOS 8 on the older models, including Dropbox and the new HealthKit service, which is designed to work with third-party wearable devices.
Users have also reported that many apps are taking twice as long to load.
Apple has said that the health and fitness application was experiencing problems that meant its launch would be delayed.
“We discovered a bug that prevents us from making HealthKit apps available on iOS today,” Apple said in a statement.
“We’re working quickly to have the bug fixed in a software update and have HealthKit apps available by the end of the month.”
The BBC has some handy advice on how to clear space for the iOS 8 upgrade on your device.