Lightning port to AUX adapter not working

Hello HansLudvig.

Thank you for using Apple Support Communities. Sounds like you're experiencing issues with your Lightning to 3.5 mm Headphone Jack Adapter. Specifically, it appears to be working intermittently. We can understand how this would be an issue. It also looks like you've updated your devices, make sure you've cleaned your ports of debris, and tested different accessories for further isolating. Those were great steps to try, they're even mentioned in the following resource here: If your headphones don't work with your iPhone, iPad, or iPod touch - Apple Support

If these steps don't help and you recently purchased your adapter, it does come with a limited 1-year warranty. You might to consider reaching out to Apple Support for additional assistance. Just in case, you can use the following link to reach them: Get Support - Apple

Thank you for using Apple Support Communities. Cheers.