IPod touch 5 won't stay charged??

My boyfriend bought me my new iPod for my birthday (October) and recently it has started to not hold the charge? It will be 100% charged one minute and then 2 hours later it is dead?! I know battery life goes down with age but it's not even a year old yet?! Sometimes the battery goes hot as well! I'm just wondering if I take it to my local apple shop would they give me a new one or send it away?! It's really annoying! I feel like I have to constantly have it on charge. And before anyone asks I haven't dropped it or done any damage to it! I take extra care of it because it wasn't me who payed for it!