I have a 500v2 on 8.0.46 in Basic Mode. For whatever reason, sometimes you cannot put the caller on hold :O !!. The system was originally on 8.0.16/18 and I upgraded it to 8.0.46, a few weeks later they are still randomly having the issue. I THINK that they might not be hitting the Phone/Exit key after being in some kind of phone menu (I've had so many people say they intermittently cannot dial out and it's because they didn't hit the phone/exit button), but has anyone else heard of such a crazy thing?