[tor-relays] Messages "We stalled too much while trying to write..."

Hi,

I am getting many messages of this type on a node with 0.2.3.7-alpha:

[NOTICE] We stalled too much while trying to write 192 bytes to address [scrubbed]. If this happens a lot, either something is wrong with your network connection, or something is wrong with theirs. (fd 1304, type Directory, state 2, marked at main.c:962).

The node is running on quad core i7 with a Gbit network interface.

The network connection is working. I never saw this type of messages on my other nodes. Any advice how to get rid of these messages?

Regards,

Klaus