Please test attached package.

It will create icon on the desktop which will toggle between speaker and headphone sound output.

It simulates real jack insertion/ejection events, device will behave as usual, for example, it will pause music when "ejecting" audio jack.

Hope it will help you.

I'm not sure what is the root couse of the issue. But I suspect that the problem is in audio jack construction. Because sometimes device detects headphones only when I'm pushing, tilting, squeezing the connector.

UPD: sources are here: https://bitbucket.org/IlyaSkriblovsky/headphonefix/src