Rain Precip. Rate value in WU shows strange value

[Gocher66]

Hello,
not knowing if this is a Nano SD topic or maybe linked to WU.

I am sending data from my Davis Vanrage Pro2, by using the Envoy and a Nano SD, to WU.
Since yesterday I have a strange rain visualization in the new WU dash board, this appears at 21:59 CET.
Till this time the value for rain Precio. Rate was shown as 0.00mm, which I assume is correct

After this time stamp the value which is shown is --.

Rain new dash_20190506.PNG (19.96 KiB) Viewed 1001 times

Does someone know what the issue is?
Can this be related to the Nano data transfer to WU? And if yes, what has change?

[Gocher66]

Seems that By rebooting the Nano, I was able to fix the issue.

On the other hand I do not understand why this could happen.