Sadly, phones sometimes go wrong, Anthony. What phone is it? If it is the Moto G, chances are it just get too empty to charge right away, the good news is there might be nothing wrong with your phone after all - but we can troubleshoot easier if you tell us what phone you have :)
Also, you might be lucky and have one of the phones with a replaceable battery - if you can't get it to charge, might be worth trying to replace the battery. Although...14months is not the average battery life...unless it sustained too much use (ie 100->0% EVERY day) as these Li-Ion batteries have around 500 full cycles lifetime.