Chony, I remember feeling the same way when I initially reported to Mr Deming about my Tyros1 USB port flaky un-reliability problem. Unfortunately inconsistent probs like this was difficult to prove, but luckily I was able to convince Yamaha to replace the part, albeit many months later, once I was able to show that other Tyros1 owners had experienced the exact same problem and had their USB port hardware replaced under warranty in their respective Yamaha Country (Germany). That said, I greatly appreciated the expedient repair & turnaround time (and under warranty to boot) Steve Deming and Yamaha USA afforded me.

Chony, thanks to Vid & YouTube, and the worldwide arr forums, your problem should be far more quicker to expedite to Yamaha Japan to get whatever bugs are in Tyros4 corrected, which is a PLUS PLUS not only for you, but the entire Yamaha Tyros4 owner community. Good luck and please KEEP US Posted on developments. Scott