Maybe this is the right place to place this post ...
after some upgrades and downgrades from 6.06 to 6.13 the problem remains. The eth4 still remains in running.
I haven't found any other discussion about that, so if anyone already solved this problem, please explain me how to.
I had the same problem on CCR1036, but with a firmware upgrade, it seem be working fine.
thanks to anyone that will give me a starting point to solve this issue.