I think it really comes down to two things.

They are trying to figure out the loads and adjusting them.
They have had so many over sold flights in the past 60 days, they are than moving those people into first which is taking up FC seats and not allowing them for battle field upgrades.

24/25 this yr, missed the MSP-SFO Sunday night 9 PM flight, i think i could of had it but checked in late.

Might miss the SJC-MSP flight this friday P6F3, i have seen everything form P0F0, P1F1, P4F3, This was all today. Now that the fare is 1300 any ticket bought and elite will get the FC seat. My 600 dollar ticket is peanuts.