Ongoing solar activity has been causing glitches in electrical things. USB and all power cords can pick up unwarranted electrical energy that must be discharged before working properly. Usbc cords seem to be the worst. Unplug all devices from wall and each connection. Tap end of cords to re ground or wait 15 seconds before plugging back in. Speeds increase when all cords are reset after a solar x flare. Hope this helps.