Internet connection dies with OMV box attached

Hi, I've internet connection problems with all my devices when my OMV machine is attached: I read an old post signed as "resolved" named "Internet connection dies when OMV box is attached" that describe a similar problem, but there isn't a real solution. I've OMV 3 on a machine with AsRock J4205-ITX that has a Realtek RTL8111GR nic, known to have troubles in linux. I tried to change the nic driver, but can't install it 'cause there are problems with kernel headers that I can't install and can't find anywhere (linux-headers-4.9.0-0.bpo.2-amd64). With NAS (homebuilt, running OMV 3.0.99) unplugged, the system works fine and the connection is stable.

Thank you

I understand, but there is an easy way to install omv5 on omv3? I've two disks in Raid 1 and I don't want to lose data.

Thank you!

Thank you

I resolved with a new omv5 installation, no need to install a new nic driver. Thank you!