TSOP4838 on GPIO with Harmony One

[Scool]

hello,
i continue on this thread as it's for an Harmony One .. all is working but some time in video menu (i only use that ) the remote no more respond, example, i press down, down, down (to navigate in my movie list) and at a tiem, it hand on a movie name (not always the same) and after i can't press up or down, if i use the IOS remote on my iphone and go back to the prev menu, the remote is back working, i can go ahead in the movie folder and scroll again the list .. it's strange isn't it ?? on another Rpi i use Raspbmc and i don't have this problem, with same IR reciever and a Harmony one (configured as same).
Any idea ?
best regards