If there's a way to toggle WiFi on/off other than the airplane mode option, then I've never used it. The top menu option is to turn airplane mode on and that's what I've always done on the K4 as well as my PW(s), all of which are SO models. This particular unit is the only one I've ever had this problem with, which is why I'm stumped as to why it's happening. WiFi is only turned on when I need to connect -- about once every month or so -- and it is very deliberately turned off when I'm finished. The little airplane is displayed when I'm done.
@eschwartz -- thanks for the link, though I don't know what that is or how it works. For now I've solved the problem at home, and I think I'll just not take the K4 with me when I travel. My PW has never exhibited the same behavior, making it my default reader for traveling, I guess.
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