I have noticed that after certain points in the game the pistol silencer is re-locked unless you go back and re-collect it, just to have it relock later again anyway.

Anyone aware of any console fixes for this?

Or if any crytek staff come across this... is there an intended patch?

Same thing happened to me. I had the silencer for 2 or 3 missions then it just disappears.

have you tried putting it on the feline? maybe it would stay throughout? im just speculating here