There have been some reports of Apple and Xbox hardware experiencing issues connecting to a number of different brands and models of modems / wireless routers after a recent update. In some cases, this can cause the modem or wireless router to restart whenever a wireless connection is started from either an Apple or Xbox device.
There are currently two workarounds in place for this issue:
Changing your Wireless security is the recommended resolution for this issue. For assistance with doing this, Please refer to the model specific support page for the wireless security setup document.