I'm having problems in all versions of mikroitk that I tested on rb RB5009UG+S+, from nana an interface simply stops communicating, it continues UP (link on) with 1Gb, nothing appears in the log, but no communication goes forward , and this rb is configured only with 1 bridge where all the interfaces are in it, without vlan or any other configuration, it is at a critical point of our network, and I bought it believing that it would be a good acquisition but I was already disappointed with that because it is about 200km from the city.
As soon as I restart the RB5009UG+S+ it goes back to communicating with all the interfaces. this happens at least once a day.