Battery and starting issues

I have a 2010 Chrysler town and
country it seemed to have a hard time
starting and a few days later it just
wouldn't turn over I jumped it and got it
home and it wouldn't turn over again so
I replaced the battery and it was fine
for about a week or two and now I am
having the same issue with the hard
time starting it will still start but it just
seems to be having a hard time is there
any ideas why this would be happening
any help would be appreciated