🙂 I would call it breeding behaviour, so I think I will just leave it in this category.
I have the same experience with males, – some males simply dissappear and live their whole life inside their caves. I have sometimes really thought I had lost the male, because I never saw him, and then when finally emptying the tank would find that he had just been sitting inside some cave which had either been overgrown by javamoss or was otherwise hidden from my view.
And other males dash in and out, busy feeding or courting females.
I think its more a matter of the individual male and his particular temperament. I had a p. linkei male which was very unstable but I also have another p. linkei who really lives inside his cave, whether theres eggs or not, he is always sitting there.