cat behavior

I live alone with a three year old male neutered Bengal cat that will often eliminate (#2) on my bed.
   
He will use his letter box that I clean daily and change weekly.
   
I've owned him since he was nine weeks old and have discovered that he is not social with others.
   
This will happen after I return home from being away for a day or when I'm there on my non work days.
   
Any suggestions will be greatly appreciated.
   
Thank you
   

So to review, your cat is pooping on your bed sometimes but is also pooping in the box, yes?
   
And the bed crapping is done sometimes when you are home and sometimes when you are out.
   
So there does not seem to be a specific pattern to the bed crapping.
   
Sometimes they become fussy little prisses who will not crap in the box unless the box is completely pristine, so try keeping a close eye on the box and scooping the moment he soils in it.
   
What are you doing with the turds he leaves on your bed?
   
The next time he leaves one, don't flush it. Put it right in his box but don't bury it.
   
Pick his sorry butt up, carry him over to the box and stick his nose right up to his own turd in the box. Hold his head there so he gets a good sniff of his poop. He will know that it's his and that this wasn't where he left it, so he might get the idea that they are ALL supposed to be grunted out in the box.
   
If he leaves a turd on your bed don't pick it up in front of him. This gives him the idea that you are his cleanup committee and he will continue to drop his load on your bed, confident that you will move it.
   
So if he leaves one on the bed, sneak it into his box when he isn't watching you, pick him up and take him to the box and make him sniff the turd.
   
He might get it.
   
If he doesn't, break out the nappies.
   
A bare bum is for good boys who crap in the box, not bad boys who leave turds on the bed.
   
Diaper him, let him crap himself and LEAVE IT there for a good half hour or so.
   
If you change him the moment he cranks one out then he will be comfortable and will continue to happily poop his pants, confident that you will rush over to clean him.
   
Your goal is for him to get a good dose of the misery of walking around in a poopy diaper so leave his load there and he'll think twice about crapping the diaper again.
   
Make sure you remove the diaper when he goes outside and also if he heads toward the box.
   
Periodically remove the diaper and put him in his box but diaper him again if he leaves the box.
   
This will help give him the idea that he is only free to crap or piss without the diaper when he is in the box or outside.
   
You'll have to keep an eye on him because you don't want him to get into the box and piddle or poop in his diaper out of desperation. The box is his 'diaper free elimination' zone.
   
If you are at work and don't want to diaper him all day (since he may get in the box to eliminate but soils the diaper because he has to), lock him in a small room (a powder room is ideal) with just his litter box, his food and water and a favorite toy.
   
If he cries, too bad. He lost his freedom when he left a turd on the bed.
   
If you really don't want to go the diaper route at all, shutting him in the powder room or bathroom with his box and food isn't a bad way to go.
   
When you are home, tether him to you at all times. Now he can't wander off and take a dump on your bed while you are home. Of course this means that you will need to periodically go near the box so he has a chance to eliminate or keep the box where you are.
   
This is why the diaper is the better route; he can't poop your bed but you are not trapped in a room with a litter box.
   
Your absolute worst case scenario is that he never gets over this and he spends the rest of his life in a diaper but it's easier for you to change him than to keep cleaning your bed and if you are alone right now, at some point you may meet a partner who is not going to want share a bed with cat turds.
   
Good luck, hope this works out.