I have 7 devices spread across 4 locations connected variously to 4 GV numbers. 3 Obi1022 devices lost their connections yesterday, same as others reporting, the others remain connected and working fine - to the same numbers. Other devices are an Obi1062 and 3 Obi200 devices remain connected to the numbers. The 3 1022 units with problems are connected to numbers that both the Obi1062 & 2 of the Obi200 units are connected to.
Obi1022 & Obi1062 units all on firmware 5.1.11
I'd speculate there is some regional problem with Obi or GV. Of course lots of possible causes for that. The units having problems are in Houston & connected to internet via AT&T. The others are in Michigan (Spectrum), Oklahoma (Suddenlink) & California (Comcast/Xfinity).