I have a DHS that has been installed since 1998 and never had anything go wrong with this system until now. When a call comes in (6x16 with 6 COs and 8 Stations)on ANY line/Any telephone, they can tell by what they hear when they answer and they tell the caller hold on I can't hear you. They place the call on hold and then go back in on the same line and the audio is at the proper level. If they don't do this, the volume of the call is so low that they can't properly hear the caller. I've tried every combination of things that I can think of except for swapping the KSU. Vodavi tech support says that I have database corruption and need to default the CPU or I have a bad CPU. To make matter worse, he has a 2nd system in another state that is doing the exact same thing so he thinks that it's a bug in the system and not the surge/lightning trouble. Has anyone experienced this before with the DHS, please let us know! Thanks!