Re: Phantom Bow gone after a couple of months?

What class were you using? I know it shouldn't matter, but it wouldn't hurt to know more details. I would recommend repairing installation for BF4 in Origin... other than that, the only thing I can think of is reinstalling the Final Stand DLC (as it provided the Phantom). It usually is a step that fixes DLC-related weapon issues.

UPDATE: I have the same issue. I will do these steps myself and if it fails I'll forward it to bug tracker ASAP.