Safe Mode puts your phone in a diagnostic state (returned to default settings) so you can determine if a third-party app is causing your device to freeze, reset or run slow.
An alternate method is available if the device can be powered on and is responsive.
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With the device powered off, simultaneously press and hold the Power button and the Volume down button (located on the right edge of the device ) until the Sony screen appears then release.
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From the System Recovery screen, select Safe mode.
Utilize the Volume buttons to navigate and the Power button to select.
Allow approximately 1 minute for the device to reboot.
Once rebooted, "Safe mode" appears in the lower-left corner of the screen.
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With Safe Mode enabled, test device and app functionality.
Related Topic:
Using Safe Mode