Unable to ping some nodes not others

So I just installed tailscale and two machines on my local lan that won’t ping on zerotier instantly work. It seems random, local machines or remote.
I have seen several others (now showing on my right) have had issues but it’s like for me all of a sudden the zt reliability disappeared. Many hours on this so I am at my wits end.
This is across several zt networks.
Any inspiration?
Anthony

I don’t think anybody can answer your question, because of too few details.

  1. How does Tailscale come to the play with ZT? Same subnet?
  2. What OS? Win / Linux … ?
  3. Any other tests, other than ping? (For example: VNC isn’t working either?)
  4. Self hosted ZT, or the global network?
  5. What version of ZT clients ?