Another post about peeing outside the box!

I have a 7 or 8 yr old neutered male LionHead. He has always been the perfect bunny. Pee's in his box, eats well, never chews. Mid June, he began peeing outside his box. It was an reddish orange pee. He saw 2 so called exotic vets 2 weeks apart, both of which incorrectly diagnosed him with a UTI (mistook the red for blood). I finally found a true bunny doc & she determined his issue was dental hooks. Teeth were floated but the peeing problem remained. Since June, he's been on SMZ, Metacam, Meloxidyl, Metronidazole, Baytril & now Panacur. All blood work & xrays are perfect so the vet is eliminating ecuniculi. The only unknown is his thyroid.
He seems fine, maybe a little more sleepy than before. He eats well but still asks for CC occasionally. I noticed he has an issue with the ramp leading to his 2nd floor living quarters so I removed it & he now lives on the lower level of his L shaped homemade condo. Yes, he is a pampered bunny!
I am at a loss as to what his problem could be. On a FB page, someone mentioned stroke but he has no weaknesses however, he does lean as he's falling asleep or resting & at times, has rotated in a circle. He also no longer zips around. He lops along normally but he doesn't run after us (when we leave his room) like he used to. A few times, he would run into our legs as we were walking & he tumbled around on the carpet until he found his feet. So, a spinal issue, perhaps, but he leaps the 14" of hardwood between carpets! We have no other pets but a dog that visits infrequently & when he does, Foof goes into his cage with a treat.
I'm hoping a member has experienced something similar & can shed some light. Sorry if this is rambling but I wanted to include as much as possible. Thank you, members!

My 11 yr bun changed his peeing habits years ago. There is a lot of guessing as to why they change their habits. I was told that he being an intact bunny might be the reason, but if your neutered bun does this, I again think that is all guesswork. Just like we were guessing that it could have been his triangular, corner litter box, or the hay/bedding, sore pads, etc. He does have spinal arthritis, but I had replaced his rectangular box with one that I cut the sides very low so he would not have to jump in. Added peed bedding to a corner of the box so he knew it was ok to go in the new box. He used it sometimes but still mostly went on the outside.
I finally started using pee pads and placed them under the litter box. Sometimes he would use the box and other times would just go on the pee pad. Eventually only the pee pad was used. A few months ago, no more peeing in the pads. He also had a pee area by the gate where another bun lives and that is where he is urinating. I took a flat tray from a bird cage that is not used, put bedding in and topped it with hay. He has been using that regularly, but still sticks but out of it and wets the floor sometimes. I have a pee pad under it now. The tray has worked the best so far.
I bought Jackson Galaxy's pee cleaner for cats and use it to clean the area and remove the odor, Bunny does not care and still wets out of the tray, but not as much as before. I forgot to mention he has some bladder sludge, so vet had that as a reason for the change also or maybe litter box is too clean or not clean enough and on and on.
Truth is, we have no definite answer, I just adjusted to his new normal and minimized the floor wetting with the wee pads. Could be an irritated urethra from the sludge. When I was on vacation I watched him on camera and saw him jumping in the litter box once! Care giver said he went on the floor most of the time. Don't go crazy looking for an answer. The common fact is that both our buns are seniors. Maybe is an elderly bun thing. It has been years with this habit. He is on Metacam for arthritis.

So true, Cuteus. This is driving me batty. I did the same thing - added a large cat pan with a grate (otherwise, he eats the bedding instead of peeing in it!) & changed the bedding. So for a 22 x 11ft room, he has 3 litter boxes of various sizes but all are easy to walk in. No idea what his little bunny problem is but thank you for sharing. Misery always loves company!