Iphone6 plus was restart unexpectly

[Ghip_koala]

I found the problem with my iphone 6 plus that always restart unexpectly since April 9, 2016 till now. I try to backup datafor restore but when I link the USB line with the computer, it shut down and restart it. I really don't know what happen with it. Is there any one can help me about this case.
[doublepost=1460648916][/doublepost]How i can solve this issue?

{"bug_type":"115","timestamp":"2016-04-12 20:25:14.14 +0700","name":"Reset count","os_version":"iPhone OS 9.3.1 (13E238)"}
Incident Identifier: 4BA5EB88-7B40-43A2-A17D-F3324655135B
CrashReporter Key: b0bf5e0f035a3b68d158cefe40d124f86044c883
Date: 2016-04-12 20:25:14.14 +0700
Reset count: 0
Boot failure count: 1
Boot faults: wdog
Boot stage: 80
Boot app: 272405795

------------------
{"bug_type":"115","timestamp":"2016-04-12 20:25:14.14 +0700","name":"Reset count","os_version":"iPhone OS 9.3.1 (13E238)"}
Incident Identifier: 4BA5EB88-7B40-43A2-A17D-F3324655135B
CrashReporter Key: b0bf5e0f035a3b68d158cefe40d124f86044c883
Date: 2016-04-12 20:25:14.14 +0700
Reset count: 0
Boot failure count: 1
Boot faults: wdog
Boot stage: 80
Boot app: 272405795