It was all great but then suddenly, my Galaxy S5 is starting to become sluggish, often freezes and turns off unexpectedly. -- What should you do if you encounter any of these issues with your Samsung Galaxy S5 smartphone? Performance issues like the phone performing slowly, often freezing, unexpectedly restarts or turns off, error message prompts, as well as inability to install or update apps can be remedied with the following workarounds and troubleshooting procedures. You can refer to this guide whenever you need it. A. Remove and re-insert SD card. Removing the SD card can also help determine whether or not the problem is triggered by the SD card. Follow these steps to safely remove the SD card from your S5 handset: 1. Drag down the notification bar from the Home screen. 2. Tap on the Settings icon. 3. Scroll to and select System . 4. Tap on Storage . 5. Scroll to and tap to select Unmount SD card. 6. Tap OK to continue. 7. Power off the phone. 8. Take ...