As it says in the subject the spotify app keeps erasing all the "offlined" (downloaded) tracks, after the whole playlist (ca. 600 tracks) is downloaded. This problem occurred after the latest update I believe it was: 0.5.2.87. 

Im running it on the international version of the HTC ONE X android 4.0.3 without unlocked bootloader, root access or custom rom.

I searched the problem and I saw a lot of people were getting the same problems except they get the 3 devices error. Which does not occur in my case. I have recently reinstalled my phone, I thought that might be a possible cause.

Any thoughts how to fix this ?