Macbook keeps disconnecting from wifi

My Macbook simply will not stay connected to wifi. I've tried every troubleshooting tip I could find. I updated all the software, reset all my network settings, forgot the network and logged in again, reset both the router and my computer about 100 times, and I still can't stay connected to the internet for more than a few minutes. Even connecting over ethernet cable didn't help. I know it's not my network - all my other devices are connecting just fine. I have no idea what to do.