I post a problem I had when transmitting and receiving a FM signal at the same time. I did a much simpler experiment (transmitting a sine wave) at 60MHz and make an FFT of the received spectrum.
Unfortunately I faced the same problem. Lots and lots of dropped frames that affects the receiver performance. I check my Ethernet controller which is a "Realtek Semiconductor Co., Ltd. Device 8172 (rev 10)" and I saw in the mailing list more users have had the same problem without finding a solution.