IR event handler is activated when no code is received.

[PSLLSP]

This is a serious bug, IR handler is called even when no IR code is received, again and again, in a loop. This is just just a bad bug. Try this demo and you will see that micro:bit beeps all the time:

https://makecode.microbit.org/_cwEXRE2JoMHh

Compare with this code, it uses library for NEC compatible remote controller, much better design; it works with the same IR remote controller from ELECFREAK even it is not NEC compatible:

https://makecode.microbit.org/_Y4tJMyPf777M