Why do I have difficulty with Wi-Fi or Bluetooth devices when USB 3 devices are attached to my computer? My 3 different USB dongles work flawlessly with my MSI Gaming laptop, which also has thunderbolt/USB-C, so there is nothing wrong with the dongles - its the Mac. I have started traveling with a 10m ethernet cable, so I can use the MB Pro in a different room to the USB router. This works when you are right next to the router. So there we have it, the only solution I have found is to use an ethernet cable and yet another dongle. This limits how many things he can plug in at one time (2, including monitor), but this is not a solution for me as I have too many peripherals (dual HD monitors, mouse, keyboard, headset, and Ethernet dongle for when I cant get wifi to work due to this issue). One of them, who is richer than the rest of us got so sick of it he went out and replaced all his periperals, including external HD etc, with USB-C ones, and makes do with no dobngles. I spoke to a few other MBPro owners, and they said the had the same problem. I have not been able to reproduce this effect. Other people have said this is due to a design fault in the MBPro, and that if you push the USB-C connector all the way in, it shorts with the unibody and stops the wifi working. The wifi always instantly connects, just doesn't work. This seems to be nonsense, as moving the dongle close or far away has no effect - it can work or not work when the dongle is close, and work and not work when the dongle is far. Some people have said that it is interference produce by the dongle.
I called up the manufacturer of my favourite dongle (Wavlink), and they sent me a firmware update, but this had no effect. So what I do is I have to unplug, replug test, unplug, replug test, wifi off, wifi on, about 30 times until, after a random replug, it start working again. With the dongle plugged in, if I stop and start wifi, it instantly connects with 100% signal, but no internet. Plug the dongle in, wifi stops working, but stays with 100% signal. So I have to use a USB C to USB 3 dongle. All my devices are USB: mouse, keyboard, headphones, HD, USB stick, scanner, printer, SD card reader.
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