奇難雜症 - Iphone 4, 5.0.1 JB, 常突然關機,不能重開

小弟電話一直都有Iphone 4, 5.0.1 JB,一直相安無事
但有一日可能同時收發QQ, WHATSAPP, GMAIL 及接電話的關係
親愛的它就關機了,完全開不回來,唯一重開方法就是插充電器
之後手機不時發生這種完全關機的狀態,要找電源插充電器重開,很是麻煩 (而且電量顯示會變很奇怪)
個人主觀觀察,iphone在沒有插電的狀態下只有50%電池時候,在用whatsapp或流動上網時的暴斃率較高
想保修,但原來一早已經過期了

問題
1. 有沒有師兄有這樣的問題?? 怎樣找尋問題根源的方法?
2. 如沒有,可有方法決定這是軟體或硬體或JB問題?
3. 如果是firmware 出錯誤了,JB過後的機徹底回復後能夠令firmware重裝嗎
4. JB後的機可以"從備份中回復" 中重新得回JB的設定嗎?


現在很慌張,常常不知手機什麼當掉,手機在工作上不能通話
希望有大師們相助

Packages
3G Unrestrictor - 2.5-3
7-zip (POSIX) - 4.57-3
Activator - 1.6.2-1
Airplane SBSettings Toggle - 2.1
AnyAttach - 1.0-8
App Switcher Rotator - 1.3
AppInfo - 1.5
AppList - 1.4.3
AppQuit Activator Actions - 0.95-1
AppSync for iOS 5.0+ - 2.2
APR (/usr/lib) - 1.3.3-2
APT 0.7 (apt-key) - 0.7.25.3-3
APT 0.7 HTTPS Method - 0.7.25.3-3
APT 0.7 Strict - 0.7.25.3-6
APT 0.7 Strict (lib) - 0.7.25.3-10
AutoScroller - 0.0.1-2
Barrel - 1.6.2-1
Base Structure - 1-4
BatteryDetective - 1.3.0-1
BatteryLogger Plus - 1.6.1
Berkeley DB - 4.6.21-4
BigBoss Icon Set - 1.0
biteSMS - 6.2
Bourne-Again SHell - 4.0.17-13
Bug Fix: Duplicate Icons - 1.0.0-1
Bug Fix: Stuck Pages - 1.0.0-2
bzip2 - 1.0.5-7
ColoredKnob - 1.3-1
Core Utilities - 8.12-12
Core Utilities (/bin) - 8.12-7
cURL - 7.25.0-7
CustomWidgetIcons - 1.0
Cydia Installer - 1.1.6
Cydia Translations - 1.1.0
Darwin Tools - 1-4
Debian Packager - 1.14.25-9
Debian Utilities - 3.3.3ubuntu1-1
Default HD SBSettings - 1.2
Diff Utilities - 2.8.1-6
diskdev-cmds - 421.7-4
Erica Utilities - beta17
f.lux - 0.983
Find Utilities - 4.2.33-6
Five Icon Dock - 0.9.3381-1
FullScreen for Safari - 1.40-2
GNU Privacy Guard - 1.4.8-4
GridTab for Safari - 1.4-4
gzip - 1.3.12-6
Hackulous Resources - 1.4
iBooks Fix for iOS 5 - 1.1
IconSupport - 1.7.6.1-1
iFile - 1.7.1-1
iHacksRepos Repo GUI Files - 2.1
Infinifolders - 1.4.2-1
Installous 5 - 5.0.3-1
IntelliStatusBarIcons - 0.95
iOS Firmware - 5.0.1
iPhone Firmware (/sbin) - 0-1
iPhone4.TW Repo - 2.1
iWipe - 1.0-1
Landscape Lock Rotation - 1.1
libhide - 2.1
libstatusbar - 0.9.3~0
libzip - 0.10
LZMA Utils - 4.32.7-4
ManualCorrect - 1.0.2-1
Mobile Substrate - 0.9.3998
More Lines in Notification Center - 0.1-1
MultiCleaner - 2.9.6
MultiIconMover - 1:1.0.6-1
Multitasktures - 1.0
MxTube - 2.0c-6
NCSettings - 1.4.1
New Curses - 5.7-12
OpenBackup - 2.0.2-2
OpenSSL - 0.9.8k-9
PAM (Apple) - 32.1-3
PAM Modules - 36.1-4
pcre - 8.30-5
pincrush - 0.9.2-1
PkgBackup - 3.1.10
PowerSaver - 1.2
PreferenceLoader - 2.0.4-1
Profile Directory - 0-2
ProTube - 1.6
Pull To Dismiss - 1.0
readline - 6.0-7
Recludo - 1.1
Repo Icons - 4:4.7
RSSWidget for NotificationCenter - 1.2-2
sandcastle - 0.0.3-1
SBSettings - 5.2.2
sbsettingstoggles - 5.2.2
Serious SBSettings HD - 1.4-1
shell-cmds - 118-6
SimpleAlert - 0.52-1
Source GUI - 1.2
Springtomize2-Icons - 1.0-1
Springtomize2-Localizations - 1.0-1
SuperMusic - 1.0
system-cmds - 433.4-12
Tape Archive - 1.19-8
UIKit Tools - 1.1.3
unrar - 3.6.8-2
unzip - 5.52-5
VIP Source icon - 1.5.1
WeeLoader - 1.1-1
WeeTrackData for NotificationCenter - 1.5
WiFi Analyzer - 2.32
WinterBoard - 0.9.3905
xSellize Security - 0.4
zip - 2.32-5
ZoomIsBack! - 1.1-1

先DFU手機 睇下係咪JB導致呢個問題出現
DFU後如果情況持續
大多數係電池影響

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回復 1# legion
死電多,換過多數冇事

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回復 2# oreo

謝謝兩位的回應!
有一段時間無JB,生疏了
什麼是先DFU手機???

不知這個資料有沒有用
用BatteryLogger 它卻說有Health92%, 4.19V, 100% 時1308mAH, 320cycle

香港換電只得先X? 幾多錢左右
如果有深圳的都可以告訴我,我不時上內地工作
謝謝

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輕輕一推!

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聽落似係電池問題
你想試下係唔係可以買外置電
差住電黎玩睇下仲會唔會突然熄機

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多數係電池唔夠力
雖然電壓夠, 但係高loading下電壓大跌, 所以突然熄機

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