Recent puchased Ex4 and disk3 with smart error

about five days ago I purchased an EX4-16Tb
I check the simple system check and no error notified, before to use it I updated the firmware.
the system become with raid5 preinstaled, and not modify this configuration.
Two days after initiate to fill the NAS with my data I saw a red led and investigate, the first check said RAID degraded and the last check, disk3 with smart error.
What I have to do?
Backup data sugested, its not critical at this time, few teras filled.

Hello,

Please try resetting the unit. If the issue persist, please contact WD Support for direct assistance on this case.

WD Contact info:

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