I'm pretty late game (40+ days) and I noticed that my fully upgraded radar keeps sounding off every few seconds. Watching the map, nothing changes except that it seems to miss a single entity every cycle before recounting it on the next try. Kind of feels like I'm working in a McDonalds right now with the fry machine going nuts.
Gosh, would I kill to have some kind of "silence for 10 minutes" feature.