RC6 and RB532 problem

Hi,
i’m expecting same problem from RC1 to RC6 with RB532.
Running on 5G-turbo band when using 2.9.44 no problem, can achieve 20 Mbit with no problem, but when loaded RC1-6 the link is starting to loose packets jumping from 8Mbit to 200kbit etc, also ethernet side becoming unavailable, cpu is going to 100%.
Tried with nstreme on , 2nd side is RC6, was RC4 intel x86 / i expect no problem on this side.
Anyone seen this ?
Thanks

Jan

what is the client in your link?