Hi there ,we're having similar issues my cocker is 6mths old always been very good in his crate and I also have a pen ,we have just come back from our hols from our caravan ,I never took the crate I took a small material basket due to not much room ,Baxter slept really well so when we got home I decided to get rid of the pen and leave the crate door unlocked (also bearing in mind he's been in the same room with us whilst on holiday ) Baxter hasn't settled at all barking getting up in the night for the toilet completely different to how he was before we went away and again like you I have neighbours to think off
These little cockers are very clever and I think he's had a taste of sleeping with us and that's what he wants to do now, but then again I have noticed other behaviour changes so could this be a stage he is going through ,up until now he has been really good with everything , we're having sleepless nights he ran off when off his lead he's started barking a lot , where's my good little cocker gone :lol🐶👹 Hope he comes back soon