Convertible top up/down lockout

[sb01box]

this has happen twice now. 01 Box
Scenario
turn engine on
initiate top fold down ~ 50%
place felt liner at the fold of the plastic window
complete the top down sequence
release parking brake
drive.

twice now during my morning rush,
turn engine on
initiate top fold down ~ 50%
place felt liner at the fold of the plastic window
release parking brake
drive (oh, I forgto to put the top all the way down)
pull parking brake
try to complete top down.
-does not work, parking brake indicator not on, top movement active indicator is on.

last time this happened, I turned the car off, after about 4 hours, turning on ignition key, the parking brake warning lamp = on, able to complete top down sequence.
any insight?
thanks in advance