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AD7730L failure

         Hi!, I am using AD7730L to reading loadcell signal in LPG gas filling machine, but there are some failure of this AD7730L after 2 years operation in LPG gas filling  plant.

         After investigation, i found the resistance of REF IN & AIN1 pins is only remain a few kilo-ohm instead of mega-ohm range when refer to AGND pin.

          The AVdd pin of AD7730L is supplied with 6.3V instead of 5V, will this configuration shorten the life span of AD7730L in long term?  

please refer to attached schematic.

Any advice?