Audio output from left channel only

My iPhone 5s (iOS 8.1.1) suddenly developed a problem with audio output last week after about 9 months of ownership. Through the headphone socket and Bluetooth streaming, only the left channel could be heard. I arranged an appointment at the Apple store and they confirmed after they carried out a restore (iOS 8.1.1) that there was only audio from the left channel. The phone was replaced under warranty.
My new phone was partially set-up in store and all I had to do was load my backup when I got home. I loaded the backup from my Mac and tested the audio output. To my surprise, the new phone had exactly the same problem as the one that was diagnosed as faulty in the Apple store i.e., audio output on the left channel only. I contacted Apple support via chat and explained the issue. I was advised to test the new phone without my backup being loaded. I restored the phone and tested the output using both Bluetooth and the headphone socket and there was a stereo output as normal. I reloaded my backup and it returned to left channel audio only. I was advised to then reset the phone and this cleared the problem. Corrupt backup data??
What I can’t understand is that two phones exhibit an identical problem, with one being a hardware issue and the other apparently a software issue. Too much of a coincidence if you ask me.
Is it possible that an app could cause a problem leading to a hardware failure?

Submit bugs to http://www.adobe.com/go/wish . More on how to give feedback: http://bit.ly/93d6NF

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