I also had trouble with a mid cycle stop. I did it once for pics in a bunch of positions, but another time I did it and the top stopped completely and was stuck.
It was on arrival at my sons basketball game, couldn't get his stuff out of the trunk, it was about to rain, etc. etc. Not good.
I went through the whole manual process, and it had lost pressure after.
I came up with the idea of doing the manual process to put it down without opening the screw, the rebuilt pressure, and then it worked. I have never stopped in middle again.
They seem very finicky....:cheers: