My nexus is charging very slowly! I tried a lot of things

A mistery with my nexus
Hello! First sorry for my bad english.
I'm running stock android 6.0 (developer preview 3) by stephanmc.
I installed months ago the twrp recovery wich I currently hace.
Since a few days ago , my phone began to charge the battery very slowly and stop being recognized by the PC.
I discovered that is charging in USB mode when it is actually connected to the wall. I'm using the original cable and charger of the nexus. I have already used other cables and its the same results.
The curious thing is that when this happens ( because if I restart the phone many times eventually works well for a while) is when my phone doesnt boot in bootloader. I discovered that a black screen appears when I reset the phone in bootloader mode. And if I restart the phone many times until the bootloader is visible , the phone charge and is recognized by the PC.
Anyone know what might be happening ? I'm from Uruguay and I have no guarantee!
Thanks and regards!

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I'm using CM12.1 last nightly and it has slowly charging ~ about 700mA.
I tried the stock kernel and the Render ones, still the same.

CM 12.1 slowly charging

I'm using CM12.1 last nightly and it has slowly charging ~ about 700mA.
I tried the stock kernel and the Render ones, still the same.