Looking for some help! I've got a mid 2015 rMBP (2.5Ghz i7), running OSX 10.13.4. I've been having this strange issue where whatever device I plug into the laptop's USB port, it repeatedly connects and disconnects (every half second or so). I've tried with an iPad Air 2, iPhone X (both using different, official, Apple cables). I've yet to try more devices - but I need both (need to do an update & reset one device) to work! I've reset the Privacy location settings I've tried both USB ports I've reset the PRAM & SMC I've ran in safe boot I've setup a new Admin account and ran them from there I've run Disk Utility/First Aid (doing it via the cmd+R method at startup) I'm currently charging both devices to 100% to see if it helps.. I'm running the most current software on all devices I've also ran a hardware test (press D on startup) I think that covers everything I've tried, for now. No dice, though. Does anyone else have any ideas?!