Just an update...
After having problems with WMP and some weird low memory error messages, I figured that the problem was coming from a 3rd party app.
I did a hard reset and installed all my apps one by one and tested WMP everytime... the culprit app is OXIOS Memory.
I got rid of it and WMP is player perfectly now. I had some problem with the side button as well and everything is fine now.
Just my 2c
