I don't think so, but it could've been that the switch was on hold when I plugged the charging cable in. I did do an update last week and whether that has cured it or possibly that I know how to use Rockbox a bit more now, but it seems to be ok at the moment.
One thing I still get occasionally is that even though I've just fully charged the iPod, when I turn it on next what I assume is the flat battery icon appears, resetting it allows it to work properly again.