My PX-3 that I've had for some time now longer remembers registries after it's turned off. Also, it won't reinitialize. It just hangs on the "PLEASE WAIT....." Screen. Like, all night long. Is there a battery powered memory in this that needs to be replaced? If so where would it be located? Seems to be memory related. I've had success working on my own boards for 30+ years and have had this disassembled to replace the sensors. The memory problem was pre-existing so I know that it wasn't related to my work on the keyboard. Can't really use it as a controller any more this way.