MZ-R30 Controls Problem...

Hi all,

I'm having problems with my MZ-R30.

First of all, I recently bought a new battery for it, but it doesn't
seem to be charging - maybe it's the battery, but I'll leave it in for
a while to see what happens.

The other thing is that the controls are doing funny things; when I
press the stop button, it changes the playback mode as well as
stopping, i.e. it goes through the repeat, shuffle cycle etc. That
also happens when I press the volume and forward/rewind buttons. In
record mode, all those buttons seem to change from mono to stereo
recording. Finally the mode button on the lid doesn't appear to be
working.

Does anyone know if this is a common problem, and if it can be fixed
easily (e.g. by me)?

Is there a "factory reset" operation for the MZ-R30?

Any help gratefully appreciated.

John