Try recording something.... then pull battery.......start it back up and hit playback to see if that works. You should only have to do this one time then it will work til the next one after you upload it.
FYI, I tried as your suggestion but D-Pad playback still lack of smoothness - recorded series of D-pad key press, playing some of key missing.
Other buttons, stick movements playback smoothly.
For the D-Pad record playback that I want to use, I need to record many times of try to get the D-Pad sequence what I need to use, so it seems working this way of my Berserker now.
But when I made a rune for same D-Pad sequence, it's working perfectly and this looks like not the hardware side problem. (So I think no need to return & diagnostics)
Let me know if you have any other suggestion.
And thanks for helps.