All volume related Synology sensors not available?

HI,

Anyone else seeing all volume related sensors in the Synology integration as unavailable?
Normally I would see the sensors for the 5 drives I have on all monitored conditions, and the volume1 sensors, but now they all are gone…

eg:

the integration setup didnt change as far as I can see, and I have simply copied the setup from https://www.home-assistant.io/integrations/synologydsm/ which has been working fine since forever, (apart from one sensor volume1 temp sensor)

what could be causing this?

btw after a restart, all sensors are back. So the question really should be: why do these sensors loose connection with the Synology, or why are they kicked out of the HA state machine…