Reply to S4 beatgridding trouble (another one)

For the first few weeks I had the S4, it seemed like it analyzed/auto gridded tracks perfectly. However, it has been way off on some tracks I picked up recently from itunes + beatport.

For example, avicii's mix of robyn's "hang with me" gets analyzed as either 71.22, 142. 56 or even 171.68. When i try to set the grid myself, when I get one marker on a beat, the other markers are so uneven that it seems impossible to get them on beat. (i have gridded some of my older tracks with no problem).

Anyone else having similar issues, or can point me in the right direction, or have any ideas? Any help is greatly appreciated. Many thanks.