Hardware Very strange issue

[ValouIka]

Hi,

Since some times, I have a problem with my 3DS:

A lot of time, it don't want to works when I press my buttons like A or B, star/select... my directional cross and pad don't work, touchscreen and even sound. But i can see my home menu, connected to internet and the only buttons who are working and my C-Stick and ZL/ZR buttons. The others buttons works in programs launched with A9LH (like Decrypt9 or Luma3DS setup). Also, it works sometimes but only for a short time (in both emunand and sysnand).

So I don't know if the problem is from software or hardware (like a ribbon cable).

Thanks! (and sorry if my english is bad)