Lumia 720 - Defective Audio Jack and Random Reboot...

I purchased a Lumia 720 from Amazon.com in the US. After about a month, sound was only coming from one headphone. I thought it just might have been my headphones, but then I tried them in a friends phone and they worked fine. Other headphones didn't work either unless it was over Bluetooth. I have also been experiencing freezing and random reboots. A friends factory reset it for me several times and the issues still persist.
I need to send it in for repair; I did verify that it is in-warranty.

this is mainly a user to user forum only for Nokia products and services, so we are of limited assistance to you here unfortunately. in this case, all we can do is direct you to your nearest Nokia Care location for inspection, if there is none nearby, then try contacting Nokia head office in your country of residence.

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    would own the same type of computer as you do any that may result in them having more insight into what could be the issue

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