[Q] Problem with the charging port topic

Hi all ! I am new here (sorry for my english by the way)

I tried to find something about my problem on many forums but I can't find anything ! I tought hère was the best place to find an answer to my question :)

I have an HTC one m8 with the Skydragon Lollipop ! I have this since like 2 months... My charging dock was perfect, but since abouth a month, I can charge my phone, but if I plug my HTC in the computer, the computer don't see it... The only way to sync things in my cellphone is to put my phone on Recovery mode !!

Do you know why ? Is there a way to fix this ?

Thanks :)