Apple earphones interfers with Siri

I use iphone xr with 128 gb space. Since the this week My earphones (the official apple that came with the phone) is behaving strangely.

It opens Siri all the time. I now have stopped as many things i could find that starts Siri, but it doesn’t help. Siri is constantly starting to speak as soon as I use the earphones.

At the same time the volume and stop/start function of the earphones are allso disturbed.

What can be the cause of this and what can I do to make my earphones work normal again en stop Siri to talk all the time?