Definitely open a case on this... but in my experience it often requires a power cycle of the shelf (not always).
Get a support recommendation...but typically what we do when we see this...
First, check "environment shelf" and see if any errors...
next, replace/reseat cables (which you did already) and reseat/replace I/O modules (which you did)
If none of those fix it and no error in ONTAP... downtime to power cycle the shelf almost always is the fix that sticks.. just had one at a customer and worked with support for all workarounds until having to power cycle.. it doesn't occur often and wasn't urgent so we waited for their next downtime window and performed the quick maintenance to resolve the issue...same thing where every hour they had the error show up.
Re: reporting as - fault on disk storage shelf - every hour.