Now resolved. Thanks! Lowering my star rating following the Dec 2020 update. I've always played on level 5 as at this level I win about 50% of the time. Since the update however, I haven't won a single game on either level 5, or subsequently level 4. Every move it makes is perfect, like level 10. Level 3 remains easy to beat, and I win every game. In short, something has happened to the leveling system so that level 3 and below is like playing a novice, and 4+ like playing Gary Kasparov.