Rx FIFO (first-in-first-out) sync errors indicate that the receive FIFOs used by the BIF-RX circuit either got out of sync with the start of frames or with each other.
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These errors mean that two frames have been discarded. However, those frames did not necessarily contain any user data (it is possible that these frames were fillers known as Null BFrames). When these errors occur infrequently, the errors are simply counted. If the errors happen too often, a hardware error is generated because a circuit failure can cause them.
Make sure you use the latest firmware. If the errors continue, replace the card.