Motu M4 Input 1 Noise

[SamSam]

Hi! This is my first post, not a native speaker but Ill do my best.

Since two weeks ago I have a really weird issue on my motu m4, theres a lot of noise coming from preamp input 1 even at low gain setting. Sounds like electric noise and it is different from normal "floor noise" as shown in picture 1. I´ve did some recordings with preamp gain alone to show how it sounds/looks and its proportional relation with gain (picture 2). Now, the weirdest thing is that when I connect any headphone to headphone output, 1-2 Out starts going through input 1 noise increasing it (video 1 will be more clear).
I believe its something related to internals, but I have no clue of what can move/change inside. I would appreciate any info or if someone had the same problem any solution. Unfourtunately my warranty expired several months ago and I dont live in the US so Ill have to figure out something.