My 15 month old Z5 has started having really bad speaker distortion. I'm not a big speaker user just the occasional phone call and watching videos via social media. Use headphones or Bluetooth for music.
After the update to 7.0 when I want to listen to music, videos, games or I get a call the speakers are not heard, just a strange sound as of interference. Same as when I choose applications or anything that uses the speakers.
