car stalling

Purchase car two years ago from Nissan with clean history and 50,000 miles when I bought. The car has always had a noisy motor. But as of yesterday my car started stalling and power was poor also engine light when on my mechanic said is the transmission , that the transmission oil is mixing with water . I don't understand how can this be I service my car regularly. And oil changes are on time they never told me I needed a transmission oil when it was checked. oil was service at 50,000, I went on line and it seems Nissan pathfinder have a recall for MODULE IPDM ASSEMBLY CONTAINS an engine control module ECM .the ECM ,at allow silicon pavor to form n over time and over time the silicon evaporates from the diode molding which causes silicon oxide to develop on ECM RELAY contact due to arcing . With the consequences of causing engine to stalling . COuld this be the reason my car is stalling did my transmission may be failing do to this .