Iphone 6 randomly shutdown in standby mode

My Iphone 6 16gb randomly shutdown in standby mode, i only can turn it on by hold POWER + HOME. here is the log :
{"name":"Reset count","bug_type":"115","os_version":"iPhone OS 8.1 (12B411)"}
Incident Identifier: F0B79DBE-0BE1-431A-813E-70E7E2C17942
CrashReporter Key: 7305c452a84bf7ce3738c4bedf794c8e76fc4c58
Date: 2014-11-24 09:17:58 +0700
Reset count: 1
Boot failure count: 2
Boot faults: wdog btn_rst
Boot stage: 32
Boot app: 2681261667
Is this a hardware issue or software issue? thanks

Hi hnguyen1982,
If you are having an issue with your iPhone shutting down unexpectedly, I would suggest that you troubleshoot using the steps in this article - 
If your iOS device restarts, displays the Apple logo, or powers off while you're using it - Apple Support
Thanks for using Apple Support Communities.
Best,
Brett L 

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