My 660 doesn't have issues finding satellites nor does it seem to have any issues using the stock HD headset and boom... however, it does like to jump between the audio volume controls on the Karmin Stereo and 660 randomly... giving me two separate volumes at awkward times, like having both somewhat in sync at highway speeds, only to switch to the 660 volume (matched at highway speed) while I'm sitting at a stop/redlight. Makes for a sudden shock to your system. Once I return the volume to a comfortable setting while stopped, when I get back up to highway speeds, it switches again to the 660 setting which is now almost inaudible. The dealer thinks it may be wire chaffing on the Karmin unit verses the 660, but still can't explain why it switches back and forth randomly. While using the CB the other day without the Intercom being on, the boom mic would randomly open, although it wasn't transmitting thru the CB, I could still hear the ambient road noise and the stereo at the same time. When the boom would activate during the Intercom use, it could be compensated by the voice activation setting, but the CB is PTT. The reason I know the CB wasn't transmitting during this open mic scenario, is that the bike I was talking to did not hear anything I was saying while it appeared to be open. During normal use, either CB or Intercom, the stereo always mutes during conversation.
Don't know how this information helps anyone, but would like to know if anyone else is having similar issues. Thanks for the option to add my two cents.