Wifi Problems

I moved to this place about five months ago, no problems until two days ago.

Apple TV will stream for like four minutes and then stop working until I reset the router.
Two 4s will not work on Wifi at all. Wifi isn't greyed out and shows a connection to my network, but it does not work.
iMac Wifi stops working often, I have to flip it off and on. Also, when i open network preferences there is an alert for a thunderbolt bridge. I don't have a thunderbolt cable.
Obviously I'm not very intelligent but I'm so angry, please help me.

I would say you have either an ISP or modem/ router problem and since you did not list any of those details it will be difficult to diagnose other than ask did you re-boot the router/modem?

I did a hard reset because I'm stupid. It worked but the network name was changed to something other than the default. I'll be changing that anyway but I thought it was supposed to reset to default.

Anyway, it's working. Cisco DPQ3925