I think the best way to have this solved is to open support ticket with collected diagnostics and ideally with wire shark trace from the device.
Anyway I would check in list resources if the interfaces are properly added on the device and polling is enabled on them.
I had a similar thing occur where data collection just stopped out of the blue. I logged a call for it and Solarwinds had me do the following.
Log onto your Orion Server as the account you used when you installed the software.
Re-run the config wizard.
Start >> Programs >> Solarwinds Orion >> Configuration & Discovery >> Configuration Wizard.
Select all the Orion components.
This will re-sync all of the components and start collecting data again.
You could try it otherwise log a case for it.