We have the same problem with Rumble who is 16 weeks. He will go to the door and bark to tell us he has to go potty(awesome). Then if we are not playing with him he will go to the door and bark(not good). We have also had the "you were just outside you do not need to go again" discussion with an accident on the floor. What I started doing is literally just start timing when he goes potty. If it has only been 10 minutes I try and distract him with a toy or something else and then we play for a little while. The next time he goes to the door(even if it is only a couple minutes) I then let him out. When he goes potty, I congratulate him and then try to get him to come right back inside. If he starts to play outside then he comes in and is in time out for a little bit. This seems to be helping to get the idea that outside is for potty only and that is boring to go out there to just potty. We have been able to stretch it a little bit longer this way but some days are better than others. Hopefully this is somewhat helpful!