Litter Robot 3 Connect - Automatic Cat Litter Box - needs repair

This is the Litter Robot 3 Connect. It's been super convenient to not scoop cat litter with the automatic cycling. It sometimes gets stuck mid-cycle, so it probably needs one of its sensors replaced, but I'm pretty sure replacing the sensors would fix the issue. Upgrading to a Litter Robot 4, so price negotiable. (Retails for $500 to $600)

https://www.litter-robot.com/litter-robot-4-reconditioned.html?robot_color=575&bezel_color=571&gad_account=937-518-9860&gad_campaignid=2089189332&gad_adgroupid=135988926705&gad_creative=597233548487&gad_dev=c&gad_network=g&gad_target=aud-1441927224473:pla-2380037871486&gad_type=search&gad_keyword=&gad_matchtype=&gad_source=1&gad_campaignid=2089189332&gbraid=0AAAAAD_gfQNF-Oda4CVbzLejnT_dIwYhb&gclid=Cj0KCQjwqPLOBhCiARIsAKRMPZrhpu7G0aYKC12jjI4eeKBarDs_UqFg_avGMQN4Mgrjn7n-fFMAe0caApbtEALw_wcB