iPhone频繁死机，自动重启

自从升级ios8.1.2以后，iPhone频繁的死机，然后自动重启。有时是正在用着，突然屏幕变暗，就死机了，等段时间以后就自动重启了。有时在就旁边放着啥也没干，就突然死机自动重启了。每次升级都没有解决这个问题，也尝试过多次DFU模式恢复。推出8.2以后用DFU刷机仍旧不管用。希望知道的告知解决方案。查看到的部分崩溃信息如下：Mar1409:18:39CloudKeychainProxy[142]<Notice>[daemon{}]:startMar1409:18:39CloudKeychainProxy[142]<Notice>[event{}]:event-[UbiqitousKVSProxyinit]<U---------->startMar1409:18:39CloudKeychainProxy[142]<Notice>[event{}]:event-[UbiqitousKVSProxykeybagDidUnlock]<UB--------->Mar1409:18:39CloudKeychainProxy[142]<Notice>[keytrace{}]:keytrace-[UbiqitousKVSProxyprocessKeyChangedEvent:]null:pending:Mar1409:18:39CloudKeychainProxy[142]<Notice>[updates{}]:updatesSOSCCProcessEnsurePeerRegistrationenterSOSCCProcessEnsurePeerRegistrationMar1409:18:39CloudKeychainProxy[142]<Debug>[api{SOSCCProcessEnsurePeerRegistration}C0x100051b34F0x10040bbf0]:Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:Theoperationcouldn’tbecompleted.(OSStatuserror-25300-FindingPersistentRef)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:(null)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSPeerCoderInitializeForPeerCouldn'tmakecoderforeIx6ZxEIGd/N9spIub/UGAOfEEMar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:Theoperationcouldn’tbecompleted.(OSStatuserror-25300-FindingPersistentRef)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:(null)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSPeerCoderInitializeForPeerCouldn'tmakecoderforGii/naahwkLqwfuF/snbzCuUTyMar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:Theoperationcouldn’tbecompleted.(OSStatuserror-25300-FindingPersistentRef)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:(null)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSPeerCoderInitializeForPeerCouldn'tmakecoderfork822BnIHkzWqM0D1orTEwsTP1QMar1409:18:39securityd[83]<Error>[SecLogging{}]:SecOSStatusWitherror:[-50]Theoperationcouldn’tbecompleted.(OSStatuserror-50-applier:keyv_RefhasNULLvalue)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSPeerCoderInitializeForPeerFounddatabutcouldn'tmakecoderforQGncLC6g6+JtsxN7wr+fZxH5d8:(null)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:Theoperationcouldn’tbecompleted.(OSStatuserror-25300-FindingPersistentRef)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:(null)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSPeerCoderInitializeForPeerCouldn'tmakecoderforQGncLC6g6+JtsxN7wr+fZxH5d8Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:Theoperationcouldn’tbecompleted.(OSStatuserror-25300-FindingPersistentRef)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSCoderCreateCodercreatefailed:(null)Mar1409:18:39securityd[83]<Error>[SecLogging{}]:SOSPeerCoderInitializeForPeerCouldn'tmakecoderfor7mXu1JYoFNersXgUv0+HtQIyq8Mar1409:18:39CloudKeychainProxy[142]<Debug>[api{SOSCCProcessEnsurePeerRegistration}]:return=1Mar1409:18:39CloudKeychainProxy[142]<Error>[SecLogging{}]:__45-[UbiqitousKVSProxydoEnsurePeerRegistration]_block_invoke<UB---e-C--->ensurePeerRegistrationcalled,success((null))Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.console{}]:notifydevent:<dictionary:0x146e00e70>{count=3,contents="_State"=><uint64:0x146e00510>:0"XPCEventName"=><string:0x146e00450>{length=37,contents="com.apple.mobile.keybagd.first_unlock"}"Notification"=><string:0x146e01050>{length=37,contents="com.apple.mobile.keybagd.first_unlock"}}Alert(0x0)forapplicants!KOdebugState:main?Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.console{}]:CircleStatus0->0{1}(s=0x146d161f0)Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:TimeuntilpendingApplicationReminder(4001-01-0100:00:00+0000)62665915276.647621Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:ACCtoken17,status0Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:NoapplicantsMar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:CircleStatus0->0{1}(s=0x146e117b0)Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:TimeuntilpendingApplicationReminder(4001-01-0100:00:00+0000)62665915276.446228Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:ACCtoken18,status0Mar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:NoapplicantsMar1409:18:43CircleJoinRequested[141]<Warning>[com.apple.security.CircleJoinRequested{}]:DoneMar1409:21:01CloudKeychainProxy[142]<Notice>[event{}]:event-[UbiqitousKVSProxykeybagDidLock]<LB--------->Mar1409:21:29CloudKeychainProxy[142]<Notice>[event{}]:event-[UbiqitousKVSProxykeybagDidUnlock]<UB--------->Mar1409:21:29CloudKeychainProxy[142]<Notice>[keytrace{}]:keytrace-[UbiqitousKVSProxyprocessKeyChangedEvent:]null:pending:Mar1409:24:07CloudKeychainProxy[142]<Notice>[event{}]:event-[UbiqitousKVSProxykeybagDidLock]<LB--------->Mar1409:32:48CloudKeychainProxy[142]<Notice>[event{}]:event-[UbiqitousKVSProxykeybagDidUnlock]<UB--------->Mar1409:32:48CloudKeychainProxy[142]<Notice>[keytrace{}]:keytrace-[UbiqitousKVSProxyprocessKeyChangedEvent:]null:pending: