Gearbox - Starting at 1st Gear

[masiuwai]

1999 Boxster S with Tips
I have owned the car for nearly 3 months. Everything is normal. One day, I started my car in the morning found that the 4th gear light is flashing for few seconds and stay at normal thereafter. Keep driving, the car is running good, so I ignore it.

After few weeks normal driving with no flashing 4th gear light. Unfortunately, it did flashing yesterday for 2-3 seconds and stay at normal thereafter. The car is still running good.

But, the car is staring from 1st gear (Normal at 2nd) when I shift the gear from N to D. However, I press on Break Pedal for 5 seconds, the gear will shift to 2nd automatically. Keep driving, stop at traffic light, the gear will downshift to 2nd as normal.

At the traffic light, try to manual shift to N and back to D, still start at 1st gear.....

Is it something wrong? Gearbox problem? Gearbox computer unit problem?

Please help.