Hello,
Please clear the NVRAM to follow the below documents ( Page 79)
HPE ProLiant DL360p Gen8 Server Maintenance and Service Guide
http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03242811-9.pdf
If the issue still persists, I would request you to log a support ticket with the HPE for further investigation. ( Suspected system board issue)
If you feel this was helpful please click the KUDOS! thumb below!
Regards,