TF A904 reverse issue - band adjustment

OK, I drove the car to dinner last night and then first thing this morning. Reverse engaged about 90% so I backed out of the driveway and proceeded down the street. It shifts fine through the gears with no flare between 1 and 2 or 2 and 3.

I have never experienced the converter draining back in to the trans and causing this type of problem on any other car I've owned. I guess dropping the pan and adjusting the rear band is then next step. We'll see what happens.

Thank you for your replies, I was hoping for someone having this same issue and the band adjustment was the remedy.
Most hi-mileage TFs of that era have this problem. But no one can say a band adjustment is THE remedy; it is only the first go-to, of the diagnostic procedure.
You could put a pressure gauge on the L/R servo port, and if you get 250 psi there at 1600rpm, instantly, then the servo will be at full travel, and then the the only known cure is to check/adjust the band. But if you drop the pan and see band chunks in there, or you see the band adjuster flopping around in there, or you manually apply the servo lever and it goes to the bottom of the bore, then you also know what you gotta do, and you didn't have to buy a gauge. By contrast, the gasket is super cheap, and if you buy a filter kit, the gasket is sorta free.