I appreciate that people seek information out, but it's best to seek it in the proper place. OBi is a device that can use many VoIP providers. There are often many places that people discuss issues with those providers, and often much more expert than other places.
There is a huge GV forum on Google, and I'm sure there are many forums where people discuss all the ways to do fancy things with GV, Google's lack of service, etc. This forum doesn't really have those discussions.
I'd recommend if you're having issues with GV you first determine if it's an OBi related issue or a GV only issue. That's most easily done by making the call again via your PC. If it happens then, it's a GV only issue. If it doesn't, it's related to the OBi.
I'm having no issues for the past many months.