Apple customers are reporting crashes after updating to new operating system iOS 9, as the vendor announces that it will delay the release of watch OS 2 due to a bug.

Not generally known for their reticence, the disgruntled Apple fans took to Twitter to vent their ire as the new OS caused their devices and specific apps running on them to crash.

"Happy #iOS9 day! Time for your apps to crash until fixes are made," wrote one user.

"iOS9 has made my phone crash like 7 times since I got it," complained hal.

"device crash after updated ios9…well played apple", wrote another user, although as his Tweet was sent via Twitter for Android, it appears he wanted to gloat rather than report any frustration on his own part.

This is not the only software woe that Apple has experienced recently. On 16 September, Apple revealed that it would be pulling the release of Watch OS 2, the new operating system for the Apple Watch wearable, due to a bug.

When successfully launched, iOS 9 should bring a range of features, including new apps such as Apple News and enhanced security features.

According to David Ingham, Consulting Director, Media & Entertainment at Cognizant (the global tech consulting firm):

"With sharper voice recognition capabilities and the distinct move towards becoming more of a personal assistant, the iOS update will no doubt have a huge impact on the digital transformation strategies of all businesses.

"The new operating system claims to be smarter than ever before but really what this means is that it is taking more control of consumer lives, updating their calendars automatically, sending instant reminders to read articles, check the weather forecast or put dinner in the oven.

"Often where Apple leads, consumer expectations follow and this move towards becoming a virtual assistant that looks after consumers every needs is a smart one, as it makes the iPhone more indispensable than ever before.

"If these expectations become the norm, businesses the world over will need to re-evaluate their digital strategy to ensure they stay relevant. Reactivity can be precarious in this rapidly changing market, so businesses must be ahead of the curve or risk losing their audience."