hi my cat Jess has been with us since he strayed to our front door on a rainy august night. he was around 6-8wks old. he took to us like he was always here and we grew to love him. he has been an indoor/outdoor cat since then. he has never used a litter tray as when he was a kitten he treated it as a plaything and once we removed it he was happy to go outside and that was that. he is locked in every night and goes in and out all day long. this past week he has been soiling the floor at night, its only happened twice. he is healthy and eating normally and doesnt seem to be unhealthy in any way. is this a behavioral problem and what should i do? he is neutered since 6mths.