My Canon 70D recently seems to have lost its internal wifi connection. Even though the settings screen shows that the wifi is "Enabled," the screen at the top of the camera shows that the wifi if off. Now, how do I turn it back on? I've checked several sources, including a thick book i purchased a couple of years ago specific to the 70D, but it doesn't have a section on troubleshooting. I would appreciate any help. Thank you.