As you mentioned high CPU, have you recently freed up space on the aggregate and have block reclamation running?
I've seen it before where I have done a large delete and the free space doesn't show on the aggregate? I am not sure what happens if you resize a vol which needs free space from the aggregate which hasn't been freed yet?
You can see the block reclamation in "priv set advanced" and "wafl scan status".
On earlier version of Ontap the block reclamation could thrash the CPU and on later version it was throttled but the downside is the Filer doesn't free blocks as quick when doing deletes and the Filer CPU is high.
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