Node-Red unreachable

Recently i get this fault when Deploying updated flows. Let 5 times ok en then this …
Then I have to reload , everything is always fine updated so means this fault is not related to Node Red.
What is the reason for this and how can I solve this?

That is typically seen when nodered is restarting, so it would appear something is causing it to crash or the GX to reboot. I suggest checking logs.

@nickdb how do I check logs ?

Just changed from working local to via VRM but there I get also “Lost connection to server” what I supposse is also happening local but then giving the unreachable message.

Update : after trying to force the fault found the flow causing the problem

Look like memory problem like different other topics. But what in the flow is causing this?
Virtual device is rather new implemented.
The Shelly himself can realy be the problem as this update is only every 5min right now.