rtl8139 - another repeating error (??)

We're still running our test system as defined previously: WebStone with 500 connections...  We find that periodically through the night (about once every 1-3 minutes) we get the following message on the receive side:

eth0: Transmit timeout, status 0d 0000 media 10. 

Is this a sign of something actually failing???  Or is it just a "I'm really busy" type of message??

soooo... if Nasdaq drops below $1, will it delist itself??