Do you check ITN before the flights? If so, how many of these flights were of the A9F0 variety at the start of your upgrade window? Those seem to be causing the biggest problems.

I've sat in coach twice on flights with domestic F this year while I was 100% on upgrades for the previous 15 months. Neither of these were EUA related (1 was sold out in F a week before the flight and the other was due to an improperly canceled itinerary), but my concern is growing as well. Really, if I can't sit in F consistently, I might as well go for MRTC.