Suddenly tonight, when I turned on my TV, the Roku (4200x) wasn't connected. I checked the connection and it was connected to my router, but then the internet was a red "x". I checked my phone and laptop and they are both connected to the router and the internet, so I restarted my Roku. After restart, it still won't connect to the internet. And I tried connecting it to both router networks (2.4, 5.0) and even tried connecting to my phone's wifi hotspot. In each case, the "router" was a green check and the "internet" was a red "X".
I know I have an older model, but when I went to bed this morning (I work overnights) it was all working just fine.