I have the exact same issue. Please let me know if you have found a solution. I’ve get a replacement modem and it has the same issue. Weird. Must be a bad batch. I think TPG should return all these modems as faulty to tplink. At this stage customer service running out of ideas and trying to convince me that it is normal. I has my 2.4ghz Optus modem are exact same spot and had no issues on cable. I only changed to nbn to get faster upload speed now I have slow download.. my work video conferences are really bad on 2.4 but works perfectly on 5g. ... View more