My Rockboxed Sansa Clip+ has been randomly freezing a lot lately, generally while playing songs. Sometimes it also gets stuck on the startup screen (“scanning disk”), sometimes it does not even see the micro SD card. These problems seem to only occur when I’m listening to music that’s on the micro SD card and they keep happening even though I’ve reinstalled Rockbox on the device, so I think it’s not coming from the software. It might be caused by either the SD cards I use or the SD port. How can I know for sure?