DDJ SX -3 Middle 2 Channel Fader Drops out at max volume

Less than 1 Year ago I bought a DDJ SX-3 & The Middle 2 Channel Faders are already dropping out at max volume down a few DB. In order to fix the problem live I have to lower the fader to bring back the level. I had this issue with both The DDJSX-1 and DDJSX-2 but not for 2 to 3 years into me using it. Disappointing and an Inconvenience !