[CypherZx]

I have been enjoying my DT 990 Premium 250 ohm headphones for about 7 months now and have a issue when I come home from work and power my PC up and the volume in the Left can is very low in comparison to the right, after I play music for about 10-15 minuets the sound slowly rises to normal and the everything is great, Im trying to rule out if the Left voice-coil is going out or may be  a issue with Beyerdynamics diode limiter or brick wall limiter is causing issues? 

 

[CypherZx]

Im begining to think my headphones dont like the snap crackle pop going though my USB port when booting? maybe I need to invest in a Schiit USB decrapifier