Hi there,
Yes I have seen those and I think I even have one, “300ma” may not be enough or large’ish input capacitor for the Xiao Startup Gulp or power.
Some testing and power profiler would be required.
HTH
GL 
PJ 
Hi there,
Yes I have seen those and I think I even have one, “300ma” may not be enough or large’ish input capacitor for the Xiao Startup Gulp or power.
Some testing and power profiler would be required.
HTH
GL PJ