@Martian Thanks for your response. I am sorry to see that you are also a victim of this.
The eerie silence coming from @Seeed does not predict something good. I personally can only say that I find the product below par, as goes for their support to solve the problem. The least they could and should do is issue a call-back program for bricked Xiao’s and re-issue a new one. Than solve the problem internally.
I never had this problem with a normal Arduino, like a Uno V3. I personally am thinking of moving back to the Uno V3 as this is a stable platform. I don’t need/want a thing that bricks for no apparent reason. That is not a platform that proves to be stable. I have serious doubts about the Xiao.