500 CRCs in 5 days is nothing, realtively speaking
That's 500 errored packets, a packet is between 70 bytes and 1.5Mb.
Anytime these errors are captured, the packet is resent by the source
You'll have no issues in the real world with these kinds of errors
500 CRC can be 1 ES or 500 ES.
Whether any data is resent or not depends entirely on what the user is doing at the time (TCP/UDP/etc).
It could be that nothing is resent.
They are on different layers so there's not necessarily a correlation between the 2.