I have had my Samsung Galaxy S2 power management IC replaced in China because before my phone was not able to power up. But this has come at a cost and with many problems, including; - Random power offs occur when in sleep mode. - Random restarts in any mode. - My current software is now Gingerbread (formerly I had it updated to Jelly Bean) What do I do? Do I root my phone？My phone is no longer under warranty, so what should I do?