Help...

Hello XDA. So, my phone's battery lasts only 4 hours if I don't use it. Last night I did the steps for reseting the battery stats (Ensured it was completely empty to 0%, charged it to 100% while it was off, powered it on, unpluged power cable, dropped immediately to 97%, plugged back in, let it charge for another 2 hours to be shure it was 100%, deleted battery stats file and unplugged the cable), and today it's still the same... Bonus to this problem, it comes another one. If the phone is on WCDMA/GSM(Auto), when it drops under 75% the signal drops too. If I switch it to GSM only, it's ok untill 30% max. Bellow that, if I try to make a call, phone app freezes and the phone shuts down. I have official 4.4.2 rooted on N7105 LTE 4G. What should I do..? Thanks in advance.

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