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Allowed to share with you that seems that your RAID has been degraded according to the information reported on the IRST. To solve this you can try to complete a rebuild for the RAID but we have to take into consideration to avoid turning off the system to avoid more degradation on the RAID, also doing a back up of all the information before taking any other actions.
For the rebuild, we have to take into consideration that during the process the data will be erased during the process, and this can take several hours to be completed
You have mentioned that drive does not report errors on the diagnostics, I recommend that you contact the drive manufacturer verify for any diagnostic tool on their part.
This following link can help you with information on how to rebuild the RAID
If the option ctrl+I does not work on your system you can contact the system manufacturer for assistance in the process