Is Mars' Atmosphere in Disequilibrium With Methane?

Methane is chemically unstable in mars's atmosphere, and any methane that's there should be degraded by the solar radiation coming through. But we've found mathane in mars's Atmosphere so something is replenishing it. The question is whether that's a geological or biological something both are hypothetically possible. Omars's atmosphere is in methane dis equilibrium, with a cycle where it builds up, then drops, then builds up again. That cycle suggests colonies of martian life producing methane as they go through their life cycles. It has been suggested that this is where mars's formaldahide is coming from. And that would suggest either that mars is more geologically active than we think