I've seen this happen with all the utility bots. I kept wondering where my bots were getting off too when they kept disappearing until I finally saw it happen with a party bot. It appears that if you don't repair a damaged bot within a certain amount of time, it will self destruct into a pile of rubble. While I don't mind it happing too much, it does appear to happen too quickly in my opinion. It is somewhat annoying that after you've spent all that time and effort building and upgrading the things that it would self destruct in less than a day after it broke down.
@208974618 Yeah, I know what you mean about the wandering. The cleaning bot in particular. That one can be anywhere. I kept wondering why I kept seeing it outside then I realized that it may clean up leaf piles on the lot. Haven't seen that yet though since I don't usually make leaf piles on the lot. The gardener bot tends to stay close to the harvestable plants and the party bot seems to stay close to where they were when you turned it on. The fixer bot tends to stay close to stuff that breaks. That one keeps getting in the way in the kitchen on one of my lots for some reason but not on others. Over all, I like them though. Just have to keep an eye on them so I can get them fixed when they break.
