Finally got a hold of customer service. They verified that connection is good, wifi and such are fine and that the issue only occurs at night.
I am out of warranty so I simply have to buy another. It lasted just over a year. Mind you, it is on our porch which has an overhang so it is well guarded.
Crystal clear video during the day, lines at night. I am very disappointing. I will be cancelling my ring basic subscription and tossing this in the trash.