Shrinking subplot in loop

I have noticed that when using subplot in a loop, the figures get linearly smaller with each loop until they have no height. The following is appended at the end of a loop and results in the problem:

subplot(3,2,1)
imagesc(tk);   colorbar;
title('temp'); set(gca,'YDir','normal');

subplot(3,2,2)
imagesc(rho);  colorbar;
title('density');  set(gca,'YDir','normal');

subplot(3,2,3)
imagesc(sqrt(vx.^2+vy.^2));  colorbar;
title('velocities');  set(gca,'YDir','normal')

subplot(3,2,4)
imagesc(log10(etas));  colorbar;
title('viscosity');  set(gca,'YDir','normal')

subplot(3,2,5)
imagesc(soxy);  colorbar;
title('shear stress');  set(gca,'YDir','normal')

subplot(3,2,6)
imagesc(soxx);  colorbar;
title('normal stress');  set(gca,'YDir','normal') 

drawnow
pause(0.1)

[Jan]

What is your question? We cannot run the code due to the missing variables and we cannot see what you observe. You talk of subplots in a loop, but the posted code does not contain a loop.

Please post a piece of code, which reproduces the problem.