Problem with "Push to talk"

Hi. I have a problem with “Push to talk”. In the beginning when i open TS it is working well but after a while it doesn’t work, when i push the button it is not working at all even the blue dot. is not working and i can’t even change my button to another.

I use middle mouse as my PTT button and my friends have been complaining that it cuts off mid sentence even though Im holding down the button.
Only happened while playing Battlefront 2.