choppy video on the fuze+?

I had some problem with choppy video on the fuze+ using the original firmware ( 1.27?) about halfway into a half hour video.  Video was mp4/aac recorded on a neuros OSD 320x240 512 kbps.  Also had same problems with b&W video recorded at 256 kbps.  I just updated to latest firmware ( 2.36.03) and so far, video does not appear choppy.  Did a firmware update somewhere along the way, improve the video problem?