I am guessing that the front screws are binding when all of the screws are engaged. The front screws are driven by one motor and the rear screws each have their own motors so the front motor may not have enough power to overcome the resistance. The situation can be aggrevated or relieved depending on how the car is twisted in various parking situations.

My Skyliner was kicking the breaker on closing. After resetting, I would raise the top about 6 inches, and then it would close without incident. There is only one point where there are two action taking place at the same time. That point is when the roof is being screwed down, the package tray is folding. The bind in my roof caused the maximum amps to be exceeded. When the roof was raised 6 inches the p-tray did not move. When the roof was then closing, the tray finished its motion and there were sufficient amps availabe to close the roof. BTW, it only took 2 years to discover the that real problem was binding and there have been no issues ten years since.

Again, it's a "can't hurt" suggestion. You can also try a little lubrication.