I think that if they settle themselves originally then the jolts are reduced...since they can settle themselves again. I find that when I get Cole down at just the right time and he's out in a couple of minutes he'll now have at least 1 hour if not a 1.5 hour uninterrupted sleep.
I had to help him settle a bit more just now...and had to wait through the 10 minutes because he kept fidgeting and crying out (and not settling back)
overstimulation might be it too. I have started a new wind down the last couple of days. 30 minutes before the end of A time I start. For the first 10 minutes we read or sing. For 15 minutes we walk around the house with him in the sling (and I tidy up!) or out in the yard. with 5 minutes left I go upstairs and sit in the chair in the dark for a couple of minutes. Kiss him and put him down. It's worked wonders (with a couple of exceptions) over the last couple of days.
good luck hana, hope it gets better.
Traci