Today I refreshed Spanish verbs infinitive 2. Usually when I refresh a lesson I receive a score of 5 of 5. I usually get this score even when I miss several questions. This time I don't think I missed that many, but received a 4 of 5. This time, about half way through the exercise, it "reset" back to the beginning. This has happened before. Does anyone have similar experiences or know why this happens?
It takes more reviews if your skill set has been "ungold" for any amount of time. I try to stay on top of mine and regild them withing 24 hours of them losing their gold color.
Even so, when one of my bigger skill sets (8-10 lessons) loses it's golden sheen, I usually have to review it 2 or 3 times before it turns gold again. There's just a bunch of stuff in there to review and get refreshed in your memory.