Was having the same issue with 1608s. I had to create a port on the switch with just the Voice VLAN and the phone would connect fine - Factory Reset - Reconnect on the port with strictly the Voice VLAN and then once it was reconnected I could replug it back into a port with Tagged Voice / Untagged Data. Happened randomly and to random phones, not sure as to why or a full solution but it worked and is still working.
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