just wanted to share that winbox runs fine with wine on chromeos. (tested with a N4020 CPU chromebook)
-enable linux via chrome settings menu
-apt install wine
-use wine to launch winbox64.exe
-create .desktop file for convenience

Hello, any progress on this? Was there any culprit?

Hello again,

It actually was the secondary router causing the problems. I'm sorry for posting without checking it out first.

Hello, I am trying to route traffic based on an address list to a secondary router (default gw: pppoe client) /ip firewall address-list add address=66.102.0.0/20 list=high_priority comment=google /ip firewall mangle add dst-address-list=high_priority action=mark-connection new-connection-mark=speed_...