tried to put truckersmp as an exception on firewall + executing as administrator, checked if the communications option in sound (on windows) is on "do nothing" : it was.
None of them worked if someone has an idea
Ok seems like The Englishman's solution seems to work, there is no sound cutting but no one's talking (i don't know if i got lucky somehow). Also i noticed a new update i'll give it a try back to CB 19 to see if it works.
EDIT : Nope still the same problem it even works when i test my own microphone too. (but before could play without problems while not being in CB19) i'll have to stick to another CB until i see if the problem will be present on my new PC too let's just put that as solved.
Thank you guys !