if you have this modem connected 1000Mbit on the LAN side and the modem experiences an RF sync signal interruption, the LAN port on the modem reverts to 100Mbit and will not go back to 1000Mbit until you power cycle/reset the modem.
quite dumb if you ask me.
edited to add that this issue is also affected by a simple sync interruption such as noise/ingress and not just loss of RF sync (after testing).
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