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You do not list your location so some generalities might help...
A failure some have experienced "blind spot detection limited" in my case occurred from
some rodent damage to the wire harnesses to the camera(s).
Pillar camera obstruction can occur from emerging from a warm high humidity garage
to cold exterior temperatures causing condensation on the glass over the pillar cameras.
One other failure I have seen is water puddling on the repeater (fender) camera lens in
heavy rain conditions...
If none of these seem similar to your experience,
it may be time for a visit to the service center.