[RodriguezFatz]

Several things:
1) You did not change the laplacian scheme to uncorrected.
2) You should use numerically safe settings for the other schemes as well, such as "Gauss upwind" instead of linearUpwind and vanLeer. If they work, you can start to introduce better schemes, one by one.
3) Using p_rghFinal with relTol 0 is a waste of time, I guess. I would commend out that "p_rghFinal" block.
4) This is a PIMPLE based solver, right? You use "nOuterCorrectors 1" which basically means, that you don't run PIMPLE but PISO. But PISO needs a Courant number of less than 1, which is already violated in the 3rd or 4th time step. Thus, you need to reduce the time step or increase the numer of outer (PIMPLE-)iterations per time step. If you do the second, you should set turbOnFinalIterOnly to "no" and also use some safer relaxation factors for the pressure (such as p 0.3) for the beginning. Try to set nOuterCorrectors 15 or so and see if that runs stable.