So you have rebooted. Why not apply the latest FastPath update and see if that fixes the problem?
It’s trivial to update
best case it fixes the problem
worst case the original issue is still there
(then is open a support case as it is may be a hardware issue and logs may be useful)
heck, I do not recall the syntax offhand but you may be able to look at the switch logs and even ontap event logs. Maybe something shows up that gives a hint