You can download extensions like FUSE for OS X, that allow OS X to write NTFS. You just install it, activate it through System Preferences, reboot, and your system will be ready to write NTFS
First of all, you should update to 8.1.3... Then you should check if you have apps like Protube (the ones to download videos and load videos faster) and delete them, they access to the hardware and make the video playback unstable on iOS 8.
You should close all your apps (double click on the...