RS3621RPxs fan noise after DSM update

Just installed the Dec2025 DSM update. My fans are now quite loud and I hear them in other rooms in the house. I've had this unit for months and it's always been quiet. There doesn't appear to be any tasks running (cou utilization is idle), so I'm not sure what the deal is.

I am using WD NVME drives in the cache card, but everything else is Synology verified.

I tried a restart and it went quiet for a while and then went back to being noisy. I can toggle the different fan modes and they all change speeds, but quiet is still quite loud.

I bought this new earlier this year and haven't had a single issue until now.

Thanks in advance!