Question Ghost Wifi APs

Once in a blue moon, I get some Wifi APs showing up in my wifi list that will not go away. I know for sure that I am no where near those APs, and the only way to get rid of them is by rebooting my phone. It doesn't appear to cause any serious issues, just minor annoyances. Other then cluttering up the AP list (one time I had around 10 APs showing up), they show up in all other Wifi related apps, and their signal strength is always at a fixed value.

Anyone else ever experience this or had this happen?

PS, I posted this in the M8 forum cause it's only happened on my M8. I've never had it happen with any other Android device I have, which are all either Jelly Bean or lower based.