My daily practice lessons seem to have peaked out and never change any more. Surely something could be randomized if you don't want to make new lessons?
Yeah it's weird I had a practice session that I failed and then when I took the next one it had a different set of phrases but it kept repeating the latter ones! It didn't use the phrases from the first practice.
So I think that when you practice, Duolingo picks 4 or 5 phrases and just mindlessly repeats them in endless combinations over and over and over. I would like more variety in my practices!