Just got myself another error also after flying more than 4hrs from KMIA-KSFO, in a default A350 (white livery) and stilll about 300nm to go:
Faulting module name: grammar.pggmod, version: 76.0.0.3, time stamp: 0x63ee0f54
I took PMDG 772 in the skies on Friday night and completed an 11 hour flight no problem. Either way, I'm not sure what/who to blame at this point.