C'mon Guys.
It has been said several times in previous posts. Lithium Ion batteries and flash cockpit fires are both great subjects for discussion and deserve their own threads but to link them to the loss of MH370 is pie-in-the-sky.
You will need to explain how an aircraft can deviate from its planned route, which was presumably loaded into the FMS, then continue to fly on a fairly complicated route to the Andaman Islands, making track and level changes that could not possibly be made solely by the unattended aircraft systems, THEN, the aircraft decides to "straighten up and fly right" and proceed to head south on its own in stable flight for 6 hours.
When, exactly are you proposing this fire took place? What combination of damages allowed the aircraft to initially make dramatic course changes then heal itself, select a new track, and fly south on a constant heading and altitude?