BB9700 power goes off byself
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I have a problem with my BB9700 that its power goes off by-self and hard to restart. I assumed that battery is faulted and replaced the battery but problem is the same. Then I cleaned it completely and reinstalled the OS but still same problem.
When it is off, if i press the power off/on button, nothing happen. If i pull the battery and push, some time it restarts but some time not. Please help.