3.4 Given a scenario, troubleshoot common mobile OS and application issues.

Common Symptoms
- Application Fails to Launch
- Application Fails to Close / Crashes
- Application Fails to Update
- Slow to Respond
- OS Fails to Update
- Battery Life Issues
- Randomly Reboots
- Connectivity Issues
  - Bluetooth
  - Wi-Fi
  - Near-Field Communication (NFC)
  - AirDrop
- Screen Does Not Autorotate

Mobile OS Issues

Some common mobile device problems are in the table below.

Application Fails to Launch Application Fails to Close / Crashes Application Fails to Update	Clear the application cache and data Update the application Uninstall and reinstall the application The mobile device does not meet the system requirements for the application.
Slow to Respond	The device is overloaded. Close applications that are running in the background and/or uninstall some applications The device is overheating, which is slowing it down. Repair or replace the device.
OS Fails to Update	Reboot the device Verify that you are connected to a Wi-Fi network Verify that you have enough free space to perform the update Try again later Erase the device and manually install the update
Battery Life Issues	Check the device settings to see which applications are draining the battery Uninstall or disable applications that are consuming battery life
Randomly Reboots	A software update has caused the phone to reboot. You sat on the power button and caused the phone to reboot accidentally. The battery is old and causing voltage drops. Replace the battery.
Screen Does Not Autorotate	Auto rotation is disabled. Enable auto rotation. The motion sensor is broken. Replace the motion sensor.
Dim Display	The backlight is defective. Replace the back light. The screen brightness is set to low. Increase the brightness. The device has a light sensor (it automatically dims the screen in low-light conditions). The sensor might be dirty or damaged. Clean/replace the sensor.
Intermittent Wireless	The wireless card/antenna is damaged. Replace the wireless card/antenna. The device is not within range of a wireless network. Improve the wireless network and/or move to within range of a network.
No Wireless Connectivity	The wireless card/antenna is damaged. Replace the wireless card. The device is not within range of a wireless network. Improve the wireless network and/or move to within range of a network. The device only supports 2.4GHz networks, and the available networks are 5GHz. Replace the device/wireless card with one that is capable of 5GHz connectivity. The wireless settings on the device are not configured correctly. Configure the correct SSID/password.
No Bluetooth Connectivity	The device is not within range of a Bluetooth device. Move to within range of a Bluetooth device. The device does not support Bluetooth. Replace the device with one that supports Bluetooth. The device is not synced with a Bluetooth device. Sync the devices.
No NFC Connectivity	The device is not within range of an NFC device. Move to within range of an NFC device. The device does not support NFC. Replace the device with one that supports NFC. The NFC sensor is defective.
Touchscreen Non-Responsive	The touchscreen is dirty or defective. Repair or replace the touchscreen.
Extremely Short Battery Life	The battery has failed, or the device is overloaded/overused. Replace the battery.