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Hi,
Does the phone power off at 50% and you are unable to power it on agian? When the phone won't power on, could you remove the battery and insert it again > Without trying to power on the phone, connect it to the charger and let it charge to 100%.
I suggest that you perform a software repair via PC Companion. This will reinstall the latest available software for your phone.
In PC Companion you press start on Support Zone > Start on Update the phone/tablet software > Repair phone/tablet (the blue clickable link in the message) > Follow these steps without having your device connected to the PC.
Follow the instruction that appears in the program and do not connect your device until this guide tells you how to connect it.
Note that, this will erase your pesonal data. Don't forget to backup your data before this repair, but I would also suggest that you use the phone for a while without restoring any backup to exclude problems related to your data.
Unfortunately, it sounds like your phone needs to be examined by a technician at an authorized service center. I suggest that you contact your Local support for information about nearest service center and/or how to proceed with this in the best possible way.
how to purchase a new battery
A battery can in some cases be purchased from a local retailer. Recommend that you check with local stores near you to see if they have any in stock. Xperia M/M dual uses the BA900 battery.