Hey SEEED Studio! I have this problem as well on an Xiao ESP-32 C6. The issue is that the power ramps up on the 5v line as a turbine generator spins up. The capacitor / resistor circuit on the EN circuit isn’t tuned optimally for this. It works great on USB power that is an instant, perfectly regulated 5v, but that is not the case in my application. It would be nice to see your boards incorporate something like an mcp130 as they are tiny and quite inexpensive. I lost several hours trying to understand what was going on as the chip was powered, 5v was stable, 3v3 was solid and the charge light even came on and the chip was warm…