Computers and devices often "cache" or save information on wifi networks you've used, including your login. This can cause problems if the information is no longer accurate (i.e. your UNI password changes) or any settings become corrupted.
Removing the wireless network information and setting it up again often resolves issues with connecting to Mercury secure wireless at CUIMC.
Instructions may differ due to the variety of hardware and Android versions used. Please check your device manufacturer's website or user manual for help on uninstalling an app or removing a saved wi-fi network if needed.