rl driver error?

[Михаил Кипа]

I have got system with rl and re cards. This system functiones as gateway, rl - internet re - 
intranet. Periodically I have 
ping: sendto: No buffer space available
on rl card! 
on logs I have
Mar 30 22:23:02 xxxxxxx kernel: rl0: watchdog timeout
Mar 30 22:23:32 xxxxxxx last message repeated 6 times
This could be improved by reboting the system, that very bad, as it network gateway!
Some ideas?

System FreeBSD 7.0 , compiled from RELENG_7_0_0