Why is my LG X mach device get into a reboot loop.

It could be caused by many factors: from electronic damage, software issue or just cache error.

At first please try to clear cache:

• Power off your device
• Boot in recovery mode by pressing and holding Volume Down and Power Button at the same time
• Release all buttons when the LG X style screen flickers and in a few seconds the Recovery screen will appear.
• If not try:
• Power off your device.
• Wait a few seconds
• Boot in recovery mode by pressing the Volume Down and Power Button at the same time for 2-3 seconds until the LG logo appears on the screen.
• Release the buttons and press them again until the Recovery Screen appears

Then you should be able to navigate on menu to clear/erase/wipe cache - manage that. If you’re not attached to your data I would also recommend a full system wipe in the same menu. Check the results.

Next thing would be to check if it’s not an software issue. You should gather more information about your current ROM version (should be visible in recovery mode) and try to re-install it (either via USB or from SD card).

If it will not help it can be that your motherboard is damaged.