My roomba is not charging

I have just got this new roomba and this is my second day of using it. When it said that the battery was low it went to its charging dock and stared charging. After an hour it starting moving and the app said that it was going to its dock again. So I moved it to the dock but it didn’t charge. I tried wiping the charging heads and the dock and put the roomba back on the dock. I did charge this time but later it stopped charging.