Xiao ESP32-C3 not running without USB programming

Good afternoon

Have several Xiao ESP32-C3 modules which all behave the same…

Attaching to the PC and program it via USB they just work fine…
But as soon I want to run them alone with just a USB power supply they never come online…also reset button doesn’t help.

Is this a general ESP32-C3 issue?

thanx in advance
richard