I thought it was my neargear router (n300) since I had the same issue with multiple handheld devices (computers seem to be ok) so I upgraded my comcast cable modem to their wifi version (Technicolor TC8305C) which only supports 802.11n 2.4 GHz (and a/b/g/n). I have been having the same problem for many months (maybe longer), multiple android devices. My fix for phone/tablet having wifi disconnect issues due to chromecast is to download the Chromecast set up program on a PC and connect it to the chromecast. The laptop is also maintaining an stable connection. Since then I have not had any issues with my phone, LG G3, disconnect and I HAVE NOT ran the chromecast app on the phone. I finally managed to get the Chromecast on the newly reset network through the laptop with several disconnects on the laptop. When trying to set up the Chromecast my laptop then disconnected. So I downloaded the Chromecast app on my laptop. When I tried to use the Chromecast app on my phone to set up the Chromecast on the network, but my phone would disconnect. I tried a factory reset on the router with no fix. My router is set to DHCP, but with reservations for all my devices. The second I hit play on netflix through my phone, it would play on TV but my phone would say "Device lost" and wifi would drop, and the router through my phone IP to 0.0.0.0. I pulled up my active wifi connections on my router and had chromecast on my television. I've had some similar issues and searched the internet and found people with all types of devices, routers, phones, tablets, and PC's, have had random wifi disconnects. Starting last week, we no longer leave it powered and only use it when we want to cast something. The problem has increased in regularity, however, and it now happens just an hour or two after powering the dongle. When the problem first started, it was only occasional, maybe just once or twice a week, and we dealt with it by power-cycling the dongle and our real access point. I've had the dongle since Christmas, and I used to leave it powered 7 x 24. Some searching pretty quickly showed the device to be my Chromecast dongle. The AP was running on the same channel as my official AP, was assigned 192.168.255.249, and had a MAC address of FA:8F:CA:65:15:06 (which, incidentally, matches no known vendors in the 4 or 5 databases I checked). It provided no DNS nor gateway services it was a dead-end connection. The connection was open (no encryption) and was running a DHCP server. This "rogue AP" was close enough and strong enough that it matched or beat my own high-power AP in signal strength. The first time we saw the issue was about 3 weeks ago, the last week of March, and when it manifested, I broke out a signal analyzer only to discover a 2nd "access point" on my network. If I make the mistake of leaving the thing powered, it's just a matter of a couple hours before one of my kids or my wife comes to me asking if "the Internet is down". When it does this, it assumes the SSID of my WiFi network - making it look like a 2nd access point. I have the same or similar issue: my dongle will intermittently and frequently go into Access Point mode, even while it's playing buffered content. Usually after about 10 minutes the chromecast reconnects to the network without me doing anything. Sometimes it will cast for 10 minutes then drop, sometimes it casts 20 or 25 minutes before dropping. I did get a little improvement when I changed the USB cable and again when I changed to direct power. So far I have: 1)changed USB cable 2)changed the power from USB to direct connect to a electric outlet 3)connected the dongle both directly to the HDMI port and with the extender 4)checked signal strength (which is 100% at -49dBm) 5) the chromecast dongle is only 18 feet from the modem 6) checked that I am the only one using the channel set on my modem within my neighborhood. If the problem was with anything other than the dongle, I would loose the signal on my laptop as well. It is interesting that when the chromecast drops, the video is still streaming on my laptop that I cast from. I notice the problem the most when cast from Real Player Cloud. I have had the same problem of chromecast dropping off the network.
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