Exactly the same issue, Turris 1.1, have connection on a few devices, status:
laptop - wifi - fixed IP (both in laptop+router)
raspberry - lan - fixed IP (both sides)
xtrend (satelite receiver) - lan - fixed (both sides)
android phone - wifi - fixed (both sides)
chromecast - wifi - can’t connect (no chance of assigning a fixed IP)
tried the solution suggested here Update broke my router
worked.