Lost audio device after Windows is recovered from sleep mode

[Wei fr. Matrix Audio]

Dear developer,I'm from a audio device manufacturer, we make USB audio devices. The device works as an external sound card for a PC. Some customer feedback a issue to us recently, they keep the audio device always connected to their PC. And they never shut down their PC, only put the PC into sleep mode when they don't use it. But sometimes when they resume the PC from sleep mode, the audio device looked has been powered by the USB bus power, but it didn't be displayed in Windows sound device list. I need to disconnect and re-connect the USB cable to activate the sound device.I checked from the

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