https://github.com/openstf/ios-minicap/issues/14
This is because the active USB configuration changes. Normally, it's "PTP + Apple Mobile Device". When minicap (or QuickTime) runs, it changes to "PTP + Apple Mobile Device + Valeria". This causes a reconnection. When minicap ends, the configuration changes back, again triggering a brief disconnection. For that reason you must start minicap before anything else and keep it running the whole time.
ios-minicap 的显示时间跟真机时间显示不一致,不知道有没有了解到原因的朋友