Thanks for the reply, just did more tests today and found that problem is pretty inconsistent. Finally only can confirm two things:
1. The adapter only can't turn on after the Switch console is turned into sleep for a relative long time (a few minutes).
2. To activate the adapter again, actually...
I got mine a couple days ago, works fine with my Switch. But if I set my Switch to "Sleep mode" by choosing "Sleep" button via the UI (i.e. not pressing the button on the console), once I turn the Switch on again, the adaptor won't turn on (the light of the adaptor is off) even I plug in out...
Is anyone familiar with former forum opg.life ? I missed the transition to the new forum over the week end (was scuba diving in the sticks with no internet connection). If anyone in touch with any members please pm me.