OMG I'm glad to hear that I am not the only one experiencing this. My 7.5 month LO has been on a good 4 hr EASY for a while and we're mostly there with dropping the cat nap but for some reason he's been having these days where his A time is only 2 hours all of the sudden. What I'm experiencing now is that after he goes to bed around 7:30 that he wakes up 2-4 times between 8-9:30, almost like he can't get into a deep sleep.
My only other question would be, do you have others helping with your lo? Maybe they are misreading the sleep cues?