I've had a few surgeries over the years for endometriosis and adenomyosis. At each surgery there have been adhesions in various places, always on the sigmoid colon, as well as endo on the bowel. Due to my long history with endo I have had to be on narcotic pain meds for a very long time. It is the pain medication that has probably caused my colonic inertia.
I wanted to reply to your post simply because I wasn't sure what lazy bowel meant but that my situation is probably similar to yours in some way.
Best of luck to you.