Same for me, I have to empty it every 2 days max. I only have one cat, female, neutered and healthy.
Smell definitely comes from the drawer, I use top quality (expensive) clumping litter so it’s not the issue either.
I have a LR3 connect, it seems there is a problem with the sealing of the drawer, I tried everything and even contacted Litter Robot to ask for advices.
I bought this for big money a few months ago and very unhappy with it. This should be replaced for a new unsmelly functional one !
RobotShop, please get back to me with a solution.
Best regards,