We have a number of Google Chromecast devices on our network. For the most part they have just worked. Lately, though, they've begun to fall off the network, and cannot then be found and/or used. Usually a power reset will get the device back on the network (it looks automatically), but for some of the Chromecast devices we've had to do a complete reformat before it will show up on the network for users. Anyone else out there with similar issues?