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Apple has released its fourth update to the iPhone operating system iOS since September, following weeks of user complaints about bugs.

iPhone users had complained about call failures and other issues affecting their devices since updating their software to the new iOS 13.

According to Apple, iOS 13.1.3 was released on Tuesday night to address a number of bugs and issues which users had complained about under the last version of the operating system.

Apple said the update:

• Addresses an issue that could prevent a device from ringing or vibrating for an incoming call
• Fixes an issue that may prevent opening a meeting invite in Mail
• Resolves an issue where data in the Health app may not display correctly after daylight savings time adjusts
• Fixes an issue where Voice Memos recordings may not download after restoring from iCloud Backup
• Addresses an issue where apps might fail to download when restoring from ‌iCloud‌ Backup

Apple's support forums and Twitter account contained dozens of complaints from iPhone users running the previous version of iOS experiencing problems both making and receiving calls.

Although iOS 13.1.2 was intended to bring a range of new features, including dark mode and swipe to type, it also apparently introduced a number of disruptive bugs.

Users complained about not being able to make calls, battery drain and overheating.

Apple released multiple updates after the most recent release of iOS in September, following a number of critical security issues. That rush might have caused the bugs, experts say.

Among the most concerning security vulnerabilities was a flaw discovered by Google's secretive and elite team of security researchers known as Project Zero.

At the time Apple said: "For the protection of our customers, Apple doesn't disclose, discuss, or confirm security issues until an investigation has occurred and patches or releases are generally available."

The statement added: "Keeping your software up to date is one of the most important things you can do to maintain your Apple product's security."

The move to iOS 13.1 was meant to patch many of these vulnerabilities. The security risks that a known software flaw can pose to users once a patch is available is so significant that experts always advise users to update.

But the inconvenience of widely reported bugs can discourage users from installing new updates, leaving them at risk from hackers and cyber criminals.

Apple quickly pushed out another update to quickly fix those in the previous release in the iOS version 13.1.1, but this rush seemed to introduce more bugs again.

The cycle repeated with iOS 13.1.2, with users complaining about issues affecting calls, face ID, mail, messages and battery life.

Apple will be hoping iOS 13.1.3 is the last update the company is forced to release for a little while.

A spokesperson for the company declined to comment when contacted by Sky News.