I have Google voice with a Obi 220. Over the last 6 months many calls do not ring, but go into voice mail. I do not have GV set with any "quiet time". I have used this setup for many years and several GV accts.
During this time, I also frequently receive a call and cannot hear the other person. They have to call back and all is OK.
Is this GV, Obi, or both?
Your first issue sounds like the one which was reported fixed 2 weeks ago. http://www.obitalk.com/forum/index.php?topic=13680.msg87969#msg87969
@OP, is this google voice account also used for a mobile phone's voice mail?