I won't keep doing this as it will become boring but just wanted to let you know that after 3 poop free nights, it ended last night.... another mess to clean up!
Nothing changed, no routine changed, nothing has spooked him, who knows what it can be. Thanks for all the help, if we find something that banishes this forever I will let you know! Yet to try some other food so maybe that will work. I just don't understand the randomness and lack of logic to it all.