I have assembled my computer using this mobo and I do not find it to have the problem that you have. Perhaps you should review the steps that you follow in assembling it.
i am afraid that isn't the problem.
is see that moire computers have this problem, i have this problem, costumers and a friend of mine have it too
i hope someone will have a solution of this problem
I have a PC with Intel DQ57TM motherboard and exactly the same problem.
OS is Win 7 x64 + all hotfixes (clean install)
LAN driver 15.1
Latest BIOS ver. 0029