IRremote plus attachInterrupt

Hi,
I'm having a problem with the Arduino, which I'm desperate for

I use the, ‘IRremote’ library to receive commands with an infrared remote control (PIN 11). Furthermore, I would like to query an external interrupt via PIN 2.

attachInterrupt (digitalPinToInterrupt (2), IRQ_Routine, CHANGE);

Both works alone.

But as soon as the IR reception is running, I get no interruption from PIN 2.
Why is that?

Why is that?

There is something wrong with the code you didn't post, running on the hardware you didn't define, with peripherals attached as in the schematic you didn't post.