Blockchain slown down
BrunoSpiquel reported that the blockchain was maybe stuck this night, I could observe that it was actually very slow compared to habitual speed.
I could see in the logs of my node that on a GIVEN block, this block wasn't always added to the blockchain, which is very strange.
Weirder: even if my node had such a bug, why other nodes did not succeed to spread the block they computed?
Finally, I simply restarted my node and all the network seems to be back to normal speed.
It is a major bug.