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Have you tried this?
There are a few things you should try first when you experience problems with your device:
1) Restart
By restarting your device you turn off all running applications and free up memory. This
sometimes automatically solves problems with your device . If the device won't restart normally,
you can force your device to restart. No settings or personal data are deleted during a forced
restart.
To restart your device
Your device may fail to restart if the battery level is low. Connect your device
to a charger and try restarting again.
1. Press and hold down the power key
.
2. In the menu that opens, tap Restart. The device restarts automatically.
To force the device to restart or shut down
3. Press and hold down the power key
for 8 seconds to shut down.
4. Press and hold down the power key
for 10 seconds to auto
restart.
2) Update
Update your device to ensure that you have optimal performance and the latest enhancements.
3) Reset
Perform a factory data reset. This is sometimes the best solution if your device stops functioning
properly. Make sure that you know your Google™ account username and password before you
start.
To perform a factory data reset
To avoid permanent damage to your device, please ensure the battery
power is more than 50%
，
and do not interrupt a factory data reset
procedure.
