Hi, I'm wondering if this is acknowledged issue, but with this model, when transceiver is put in SFP port, the fan goes all the time on (I think) max settings, because I can hear it faintly from 50 meters and loudly from 30. By far the noisiest electronics I have. You don't even have to connect fiber to it, the fan stays on as long as transceiver is there. To me it makes no sense, because unit is silent with using copper on upper port, but fiber is producing way lower heat than copper, and nobody puts copper transceivers on combo ports. I have 2 units, one connected with fiber and one with copper (both 10G) on upper port, the second one is warmer, yet is silent, while fiber one blasts the room with noise. For example, copper ends at 10G (some cables will advertise more, but good luck finding switch/network card with copper above 10G) because it's power hungry and heat producing, but fiber goes 100G and beyond with just passive cooling like Mellanox 100G NIC's . I even tried to move that unit outside, fan still goes the same, so it's not even relevant to temperature, firmware just sets it to max all the time with SFP, which is totally unneded. Please set fan behaviour like upper port, or better yet, allow us to do fan control in Deco app. Right now, I'm thinking about returning or just doing a teardown and cutting power to fan. Please set my mind on ease with at least acknowledging the issue and a promise for firmware update. :) Thanks