the ios 11 update was criticized for changing the way the buttons for wi-fi and bluetooth work; more specifically, the toggles would disconnect devices from wi-fi or bluetooth, while leaving the radios on. the electronic frontier foundation stated that this change not only hurt battery life, but was also bad for security, describing the buttons as turning wi-fi and bluetooth "off-ish" (greyed out, but not crossed out, as it would appear if switched off directly from the settings app), as well as further criticizing the connections resuming at 5:00 am everyday.