The first thing is to check that the charging issue is related to the phone or the charger itself. Try and use a variety of chargers and outlets. You'll also want to make sure you use at least one official Motorola charger.  Next, check the output capacity of the charger. It could be a slow charger, meaning it might simply be a case of insufficient power. Finally, check for any damage to the charger, cables, plug socket, and phone connections. It may take a while to charge a phone when it is completely dead. If everything above is okay, but the phone is still not charging, you might need to do a forced reboot. This will not delete your data but essentially refreshes the phones, sort of like blowing into an N64 cartridge or tapping the games console a few times. Each phone might have a different way to reboot it, so Google to find the process for your particular phone. Usually, you press and hold the volume up and power button together for around 30 seconds.  Finally, if this does not work, then contact Motorola directly. It may require you to send it off for repairs.