I have a very specific and confusing issue with my Three 5G WiFi service. Essentially I am using a Huawei CPE Pro 5G router from Three, with a Three SIM card. After working perfectly for a month to begin with, suddenly last week I began experiencing problems. The WiFi kind of works, but not really. Specifically, the symptoms include (but are not limited to):· Zero (or very low kbps) upload speed when using phone, despite up to 300 Mbps download speed (using multiple speed test apps), however upload speed shows as up to 100 Mbps using Macbook· Internet very slow and unreliable (all devices), sometimes things work find and load fast, other times it just doesn’t work at all· Whatsapp messages not sending but receiving messages is fine· Youtube app not loading on Android phones (three tested so far, this is actually the most consistently reproducible symptom so I kind of use it as a test of whether the internet is “fixed” yet or not)Here’s where it gets weird.· Three sent me a new router, the problem persists· I ordered a replacement SIM card, problem persists· Putting the Three SIM card in my phone, it works perfectly, Youtube app loads, great upload speed, etc.· Putting the SIM card in an older Android phone, it does not seem to get a 4G signal, and data is very slow· Putting an ID Mobile SIM (uses Three signal) in the router works perfectly· As implied by the above, the signal is great, this is absolutely not a signal issue· Hard resetting the router, factory resetting, etc. has no effectTherefore it seems to me, as everything that can be replaced has been replaced, and using a different SIM card (that also uses the Three signal) or putting the Three SIM card in my phone works perfectly, there is something relating to my Three account that is causing this problem. However, their first- and second-line technical support basically had no idea what was causing this. There is some kind of investigation that is meant to have been completed by tomorrow but I am really not holding my breath that this will resolve it.Does anyone have a clue what could be causing this?Other things I have tried already:· Manually setting DNS to 80.80.80.80 and 80.80.81.81, which I saw as a suggested solution on another thread