Hello, It has been 10 days now since I received this router. It was all good until last night when the router started making consistent noise. I believe it is a fan who is consistently running. It needs to restart to stop that noise. It is all quiet for a few hours after the restart and then there is a consistent hissing sound. It is fairly audible during night time. I am thinking of sending this device back to Amazon. The temperature is normal in the room where the router is placed. The firmware was upgraded to the latest version after receiving the router. There is No stress testing going on and only 4 devices on the router with less than average traffic. Regards.

Hi @jj_1122 , We have confirmed there is noise when using this FWA510. Please click this RMA link to initiate the RMA process. Thank you!

Zyxel FWA510 fan making consistent noise

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