Frozen screen, bug 999 - multiple sources

[Lorrainbow]

Version: 2.5.47
Issue type: major bug
Hardware: elecfreaks (smaller screen)

Replicate

1. From the home screen select the save icon
2. Select any of the saved files (1, 2 or 3). I chose 1
3. In the blank screen create the following program(s)

Instance 1:
WHEN
Hear > 1

DO
Show > Smiley face

Instance 2:
WHEN
Temperature > Warmer
DO
Show > Smiley face

Instance 3:
WHEN
Light level = 1
DO
Show > Smiley face
(NOTE this crashes when you shine a light on the micro:bit. All other programs crash when you create them)

BUG: The program freezes, displays a sad face on the micro:bit followed by the numbers 9 9 9 .
After a few seconds it return to the home screen, displays 999 again and is still frozen. Github won't let me add a video...

This permanently freezes the micro:bit. It displays 999 on boot. If you're quick you can open the program and delete the line. Otherwise you have to reflash.

[Lorrainbow]

Another 999 bug, this time not involving the menu or any of the sensors

In this program, it works fine when you slowly press A again and again. If you press A quickly you get the 999 error