My favorite stupid wifi thing I ever had, for some value of favorite, was a previous incarnation of my home router, which apparently had a known issue where certain Intel wifi cards connecting to the AP would cause it to start having firmware crashes randomly, which I discovered when I brought home a new laptop and my wireless on every device started being unreliable...

Nothing to be done about it other than "don't do that" or "replace AP" since the firmware is a black box. It was...maddening.