PIC24EP512GP806 DMA ECAN FIFO fails to set the C1RXFUL1 or C1RXFUL2 bit (hlukeh)

I have been using the PIC24EP512GP806 in a CAN application for years. Last week I noticed that it was sometimes not receiving a standard CAN message that was being broadcasted once per second when the message count was around 2500msgs/sec. After a week of..