I experience this too, except that the E750 stops broadcasting the SSID, which obviously makes debugging the device via ssh, the API, or the web app (admin panel) impossible via the wireless connection, which is incredibly inconvenient.
@alzhao, would you care to post the solution you provided to @FullDuplex via email in the public forum so that other customers might benefit from the solution/s you provided? If not, I’m happy to open another issue and post.