John deere 567

Today I was baling and my door on my JD 567 baler kept coming open and I could not shit unless I ejected the partial bale. I kept baling and the net wrap wrapped just fine but something is obviously wrong. I set my bales at 67 for size and wrapp them 2.9 to 3.2 wraps. The door would usually come open just enough to set of the sensor around 57 size wise. Later today I was on my last field I broke a belt and only had a couple bales to make so I removed the belt and finished sounds stupid right but my father insisted I finish but with the missing belt the door would open at 24 size. I am just wondering. If this has happened to anyone. It has happened were tha baler is reaching full and I hit a bump and it opens bit I can always get it to shut except today. I run my baler on a JD 4240 I just don't even know where this problem is coming from



John deere 567