Hi,
I'm having the exact same issue.
Dell R650xs
BOSS with M2 in RAID1
Broadcom 25Gbps NIC's

Glad to find out it's not an isolated issue. All is working fine in 8.2.1 in production for almost 2 years now, but of course 8.2.1 is out of service so I'm hoping the new ISO will be out soon.

thanks,
Marc