5GHz WiFi has more bandwidth than 2.4GHz, so typically will involve larger IO buffers in the driver, which could easily be enough to expose a memory scribbler (I imagine there's a bunch of other features that are enabled/disabled by the frequency band switch too). However, I think asdfasgasdgasdg's answer is the correct reason not to suspect a memory scribbler - ie a memory scribbler would cause the driver to crash/fail and the kernel would log a message.