Suddenly my 6300 'data interface' is acting up. I can see it most clearly on the DAX Control Panel; the Mic Stream and RX Streams indicators 'go yellow' every few seconds and a horizontal black band appears on the waterfall. The 'text' feature during an 'off cycle' says "data not arriving from radio, check firewall." I've checked the firewalls and they are off. So now what? This phenomenon just started with no changes to anything. I've made a few contacts under these 'conditions' with OK signal reports (no one says I'm dropping out), but I've noticed that if I key the transmitter during an 'off cycle', it does not transmit. These cycles are very uniform, coming at about 13 second intervals.