I have had my 13 in macbook pro for about three months and suddenly it does not charge when it is plugged in. In the last week this has started to happen but upon fussing with the connection like unplugging and replugging in the magnet charger it would start for a while and stop randomly. Now I can not get the computer to charge at all no matter how much I fuss. Do I need a new adapter or is there some other problem?