Okay, so I just bought a Raspberry Pi 3 and set up SSH on it (putting empty file "ssh" on boot partition of SD card) and plugged it into my router via Ethernet. Everything was working fine. I then tried to see what the Pi can do and hosted a simple web server on port 80. I then port forwarded ports 80-90 (I would use ports 81-90 for other stuff) and tested it. Everything was fine and working. One time I tried to set up wireless WiFi but shrugged it off because it didn't seem to work and didn't revert changes. After a while I decided to see what would happen if I forwarded port 22. This was when my router started slowly dying. From that point on I couldn't connect to any website at all. Unplugging the Pi would restore everything. But plugging it back in would kill the router again. I thought that port 22 had something to do with it (idk) so I turned it off. Still would kill my router when plugging in. I pulled the power plug on the Pi to kill the web server process and plugged it back in. Still killed my router. How do I fix this?
Can only connect to RPi using PuTTY on Win10 PC, no external keyboard
RPi doesn't use Raspian desktop or whatever that is, just the raw shell