I am almost certain as to what this could be. My guess is that the ROM you are using has the 10MB RAM hack, and you are using an app of some kind using 3D rendering. This will cause almost the same issues.
Empirical evidence can never establish mathematical existence - nor can the mathematician's demand for existence be dismissed by the physicist as useless rigor. Only a mathematical existence proof can ensure that the mathematical description of a physical phenomenon is meaningful.
-- Richard Courant