Ok, Eric, thanks for your thoughts.
For Number 2: I found a 15’ Ethernet cable, and power cord, and moved the hub as far away as I could. I’ve had smartthings for about 3 years now, and never had a problem. I’ve read this before, so I figured I’d give it a shot. I’ll have to remount everything at a later time. My utility room looks like a spider web 
For Number 3: I honestly had forgotten that I got a new router, and never went back to hard code the wifi channel to 11. I remedied that this morning.
For Number 4: See aforementioned Spider web
For Number 5: This is my first go-to solution. I unplugged it for about 1/2 hour again. I had to move it anyways.
And… bingo. Most of the devices are coming back online by themselves. The only things left are the water sensors not coming online. I’ll give them a bit and try pulling the battery and seeing if that doesn’t work.
At least all my automation works again. Hopefully this can help someone in the future.
Thanks much!