The JP node has been losing network connection on and off over the last few hours.
The provider says there's a DDoS going at their servers.
The most annoying part about it is that I'm in Tokyo and still losing connection directly to it/can't connect to it.
As usual, you should have a backup to one of the other nodes - and from Japan that would probably be best to use stratum.kano.is as the backup.
They seem to think it is now resolved - and the last disconnect message I got was about 20mins ago so hopefully all OK again now at the JP node.
This is going on again today also

They said they fixed it again today but then it started yet again.
As before for the few people that mine on the JP node, be sure you have that backup setup.