Has anyone had a problem with the IPK version 4.10 CO Lines locking up. I've had a recent rash of this probem. The telephone keys are programmed as direct access keys. They are DITed to voicemail in nite mode but when they lock up the voicemail ports are clear.One customer said they went to use a line hung up but the line went red then the others followed suite. The CO cards are COIB 8 and are programmed as CO. Any clues? Thanks.