I hope a few experienced users will reply and provide better assistance for you.
I think the SanDisk Clip Sport was first available for sale in Feb. 2014 (not 2011).
The type of problem you describe can many times be resolved by applying the correct, most recent version of the Firmware for the specific player. (It is critical to not apply the Firmware from a different player.)
Here is a link to the current Firmware (FW 1.39) for the Clip Sport with installation instructions.
Your comment about files playing in fragmented order makes me think you may have some problems with the ID3 tags in your mp3 files. I use the software “mp3tag” to manage my mp3 files.
Here is a link to the user manual for the Clip Sport.
