<human>: Can you succinctly summarize the text in 1-3 sentences?

Hi Reddit! First of all thanks for taking the time to lookover my post. 
I have a 6 month old female manx kitten, that seems to randomly decide to not use the litterbox. She has been spayed recently but the problems began before this. We have two cats in the home, a two year old male manx and her. They get a long great! 
So here is what the specs are of our home. 
We have two litter boxes, one that is covered and one uncovered, they are in our laundry room which is semi private and very quiet. One box is covered and one box isn't, we have used the same litter since we got both cats. The box is cleaned once (sometimes twice) a day. The kitten does not have any health problems as she has been checked over by our vet. The box is nowhere near their food. 
I don't know what to do. I feel like we have done everything right, but the kitten still chooses every once and awhile to pee or poop outside her box in various places in the house. She will poop usually in the kitchen and she likes to pee on my bed (but no one elses) What can I do??!?!
<bot>: Kitten peeing and pooping randomly outside her litter box, we are following all suggestions and kitten has been checked over by our vet.