Battery - charging

[emk]

Phone battery goes up and down between 6% - 7% while charging
This happens for about 5 minutes then it starts charging normally
When it's 9%, it sometimes goes down to 5% suddenly

[Phy]

Repair the phone with Sony PC Companion and check if you experience the same issue.
http://support.sonymobile.com/gb/tools/pc-companion/