And, yes I made a ticket on support when I posted about it. (June 1st) What they did with it? They marked the issues as ‘solved’ without any follow-up or reply from support.
That’s how Fairphone rolls when they don’t want to acknowledge the problem.
And yes, the issues with wifi on 5GHz with routers is a long standing problem, especially with Fritz!Box routers.
But I will test the new update on my router when I have time.