LENOVO K3 NOTE ISSUE-BATTERY DRAINING FAST AND USB PROBLEM!!!!!!!!

i have a problem in my K3 note, bought recently through flipkart..the phone was working fine but suddenly, now USB is not detected...whenever, i attach to the AC charger or charge with USB connected to laptop, it is neither getting charged nor USB is detected... But if i switch off the phone, now the phone gets charged... i have not been able to identify what the bug is about? i have factory resetted and also the battery was removed several times..however, the same problem is occuring.... Hope, i can get a solution from this portal Battery is also draining fast after this bug has started. Thanks in advance.

since many people reporting the heating issue.
i would like to ask you a favor to help me to do a experiment.
i am not sure if you guys know we have a feature called "background app management", it can restrict background tasks to block them consuming current drain. The heat could be generated by drain consumption.
the feature is at Settings->Power manager->Background app management.
I made a video shown at below link:
https://drive.google.com/file/d/0B9700J-TyX52clFQUWRDUEVHWlE/view?usp=sharing
Please let me know if you can get some benefit on this issue.
Thanks
Wang

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