I recently updated my Z Ultra to 5.0 Lollipop. Upon installing the update my phone has been very very slow (many apps refusing to open and crashing). I decided to take my 64GB MicroSD card out and the phone went back to normal. Without the SD Card its normal fast speed, with it it becomes very slow and unusable. I have formatted the card and that seems to have made no difference. I've done a system reset twice now and still not difference. Any help would be much appreciated!