Issue when taking off from standstill - jerking/lurching

[bung206]

Car is a 2006 Toyota Yaris 3DR hatchback. 4SP Automatic transmission. About 70,000 mi (110,000 km) on the odometer.

Issue I have is very peculiar.

When the car is at a standstill and I accelerate, the car will slowly start moving, then it's almost like it drops a gear and floors it. This causes the car to lurch forward.

At first I thought it was me not being used to the throttle, but no matter how hard I try I can't get it to take off smoothly. It seems intermittent. Out of ever 10 take offs from standstill, it will probably do it 5-6 times.

Once you're moving, the gearbox shifts smoothly at all other speeds.

I've owned the car for almost 1000 mi (1600 km) and it hasn't gotten any worse.

No check engine light or any warnings indicated on dash. I have scanned for errors via the OBD port and not found any DTCs stored.

Any ideas what this may be?

I know this is like asking how long is a piece of string so any help is appreciated.