It always worries me that when they start doing something out of the ordinary like this for no apparent reason they're trying to tell us something is wrong health wise. I've had this happen in varying degrees with three different cats.
One kitty I was especially connected with did everything he could to get my attention. There were two other adults in the house, but he targeted me. Piddle on the rug beside my shoes (thought he was upset I had gone out, he was known to get upset but the piddle was new). Piddle in my bathroom, somewhere I was known to go everyday, multiple times a day - found on the floor mat in front of the sink and in my walk-in shower, and finally I was in the middle of an outdoor project, using a rubbermaid tub to lug my tools inside every night. I have no idea how he got up on that tub with no lid and balanced on a bunch of hammers, drills, tape measures and whatnots to piddle in the tub.
This is my extreme example, and was difficult to figure out what was going on. He had Hyper-T (treated) and EPI (controlled), ended up being colon cancer. I'm not telling you this to scare you just to emphasize how ingenious they can be when trying to tell you something.
ETA - Upon DX the behaviour stopped.
