Losing all network connections - notifications again and again?

Today I was in the cellar of the house. This was the reason for a complete abort of all my network connections for some minutes.

During this time my FP3 (/e/ 0.15) didn’t stop to notify me again and again, every 5 seconds, including sound, about the fact that I did lose my network connections.

Is this intended? I switched on Flight mode to suppress it.