Hi Anne,
Sorry to hear from your problems.
Just to be sure: goto Settings - PRS+Settings - Keybindings - Otherkeys and check if there are other values then "default"
If it's turns out to be a hardware problem:
A) contact Sony. If you are in the EU there is a 2 year consumer warranty as oposed to the guarantee which might be limited
B) you can temporary assign these key-actions to the volume-key.
HTH
Mark
PS: Please update your user-profile to show the 650 beside the 505 and the PB 360
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