Could these be probes for updates? Do you see any other traffic attempts towards these sites?
But yeah I have given up using such NAS machines looooong ago.
They are cheaply made, they usually do not have the horsepower to support the full bandwidth of the ethernet ports, heat management is bad or non-existent (directly affecting disk life) and the custom firware (read half-baked) rarely works as intended without issues. And if anything goes wrong with a disk, you are pretty much eFed up because it will take forever to rebuild volumes (if you are lucky) or recover the sytem (if you are unlucky).
I always ended up trying to install some micro Linux distro on them, but after a while (when my time became more expensive) I decided it was just not worth it.
A few years back I built an HP microserver running a proper OS that works as intended without surprises. And of course I never looked back or spent any more silly money on toy devices with a short expiration date.
Sources: Modified SL1200 MK2, Salas folded RIAA, Phonoclone, VSPS, Shelter 501 MK2, Modified Pioneer P6D6 as transport, Shigaclone transport, Peter Daniel NOS DAC.
Amplification: Custom 211 Monoblocks, Electrocompaniet AW120, Audio Research VS110, Gainclone
Loudspeakers: Tannoy Turnberry, PBN Montana EP Signature
Cables/stands: Tempflex ribbon and Twinax cables
Other: Promitheus Signature Passive Attenuator, Custom JFET - transformer preamp.