Midas DL16 Stage Box

New

I'm currently getting inconsistent performance on a couple of inputs on the DL16 Stage Box. Specifically, the overall gain levels drastically vary from week to week as it's used primarly on Sundays at church. To clarify, the parameters themselves don't vary, but rather I encounter significantly decreased input signal. I've ruled out mics and cables..i.e. input 1 causes trouble so I move it to input 9 and it's fine. Do you think a firmware update will solve this problem? My m32 console is current.