My chromecast is set up on my TV. It works fine if I cast from any tablet or mobile in the house. However as soon as I try to cast from chrome on my laptop, it says "evice not found". And before you come back and give the usual have you done this's, I've checked this forum and done all the things suggested, including resetting chrome and resetting the chrome cast. Both devices are connected to the same wifi network so I know that's not the problem. It was working fine until about 2 months ago.
