DeltaV V13.3.1 AI Card 4-20mA HART IO Card SV dropping out intermittently

DeltaV System running V13.3.1 

The SV of a HART signal will intermittently drop down to zero then come back up to normal reading. The primary variable that uses the hart_field_val remains a constant reading. The control module is set up as a PCSD Analogue Input Module V13.0.0

Diagnostics value shows GOOD for Overall Integrity.

CalebHolland