Since aprox. 6 hours ago my x11 hashrate has been displaying wrong(?) values.
It now shows ~38.7 KHash/s instead of my usual ~10 MH/s. It's like that on all my workers.
I can confirm however that all my rigs are still mining as usual and that I am also being paid like I mine with ~10 MH/s.

EDIT: now also the x11 port says 0 GH/s, while still mining.