I would like to give you guys an update concerning my delay problem with the Walkman: After a lot of emails with the Sony Support since then, they said I should send it for a repair to a Service Center. So I did, but to Amazon which forwarded the Walkman to a repair service center (third-party, not original Sony).
- Of course, the repair center couldn't comprehend the issue, did just a factory reset and sent it back. The issue was still present, no improvement at all.
- I contacted Sony again, they escalated the case three times in a row and I had to tell everyone again the story and gave them a link to my video showing the issue:
- Sony asked again to send the device to them, but directly to Sony not over Amazon.
- Approximately one week after their last reply, the issue disappeared. I can't reproduce it even if I provoke it (big playlist and long playback before). There is sometimes just a very slight delay, but it's far away from the behavior I experienced before as shown in my video. I didn't change the firmware (3.xx) neither uninstalled/installed any updates nor changed any settings. I have not idea why it disappeared, but maybe an app update is responsible for the solution of the issue, because this is the only thing which could have changed something on my Walkman. I thanked Sony but also told them to focus more on software running on their products. They improved compared to the last decade, but there is still much room for improvement.
- The newest firmware 4.xx also didn't change the "solved" problem, I would even say it got a little bit faster and more responsive.
Therefore, I've finally gotten happy with my ZX507 Walkman.