I have noticed the same - in the past when you book 355 days out, they usually released 2 seats in J and in F on the 1x Avios. This was as recent as June this year for a trip in June next year. Since then, I've noticed that they don't seem to follow the same approach in releasing seats and many of the flights I'm seeing, even 355 days out are pricing at 2x Avios or no availability. I hope it's not a sign of things to come.