It might be a software problem (or not) and we know that they are planning a change for the next release that will hopefully help people using WiFi pairing for trainers (see this post) but my intent here is not to debate that point - what I want is to have a way to ride when I want to, and I want that for you too. I don’t want you to wait for that release to find out if they were successful. That particular dongle is known to be a good one (I use another one with the same RealTek chipset and it works great) but if you are not interested in that, my next suggestion is to pair the trainer via Bluetooth through the Companion app and see if it helps.