TimeCapsule (and AirPort extreme too) hangs on large file transfers

Greetings,
I got a following problem. I had install AirPort connected to my router with copper and extend network with TimeCapsule. TimeCapsule have two USB drives attached, AirPort - one USB. When I am transferring a large file, in a magnitude 2-3Gb or multiple simultaneous transfers of smaller files to/from those USB drives, depending on which drive I am using the AirPort or TimeCapsule get crashed. For plain user it is looks like as of sudden, data transfer stops, led in a front keeps green, and I can not reconnect to the drives. If I powercycle TC or AES everything get back to normal. Are there anyone else experiencing the same issues and if yes, what would be solution ?
Thank you.

I think we have tried almost every combination of disabling Large Send Offload, TCP offload, IP SEC Offloading, VMQ and Receive Side Scaling possible - in the various places there are - although I will be quite honest - as there are 3 places to do this
for each Server (the related physical and virtual NICs on the HV Server, and also the NIC in the VM) it is possible we may have missed an iteration...
During our testing we have noticed that the symptoms of the problem gets worse the higher the transfer speed is. For example if you transfer to the VM from a desktop with a 100Mbs NIC, there will be subtle lag and a transfer speed of say 10 or so KBs ,
if you use a device with a 1Gbs NIC, you on average achieve 50-70 KBs transfer speeds and the higher the number, the worse the GUI / Server locks up (although the transfer completes just fine).
We also tried throttling the bandwidth via the 2012 GUI - to see if that helped, but none of the changes we made seemed to work, and we did not have time to try the powershell way of doing this.
We did replace one of the VM's NIC with a legacy one as part of our testing today, and now data transfers to the VM from a PC with a 1Gbs NIC run slower at around 30-35 KBs and the are no noticeable GUI freezes, although during the large transfer
it looks like 1 in every 30-40 packets is dropped in a continual ping that runs during the transfer period.
We have done a lot of cable replacing today (out of diligence) but there seems to be no noticeable issue. We also tried and older NC380T dual port NIC we had available and used the standard driver Windows offered instead of an HP one, but the problem
was identical no matter which NIC we used.

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