Operations and differentiation with symmatrix in MATLAB

Question

Step 1: declaration of symbolic objects using symmatrix:

n = 2;

A = symmatrix('A', n);
lambda = symmatrix('lambda', [n,1]);
g = symmatrix('g', [n,1]);
phi = symmatrix('phi', [n,1]);
l = symmatrix('l', [n,1]);
item = symmatrix('i', [n,1]);

Step 2: declaration of equations:

arga = (l.'*(((lambda).*(A * g)  + (phi.'*lambda) * (A * g))));
argb = (l.'*(((lambda).*(item) + (phi.'*lambda) * (A * g))));

Step 3: differenciating with respect to lambda: arga and argb should work in the same way, as both item and A*g are 2x1 vectors. However I cannot run the sum in the parenthesis of the output for sola due to dimensionality issues:

sola = diff(arga, lambda)
solb = diff(argb, lambda)

Step 4: Moreover, running the example below, sola and solb give two different results when substituting item with a*g, which should not be the case:

l=[1.2;1.1]
g=[1.9876;1.88]
phi=[1.0987;1.5192]
A=[132 123;1222 124]
item=A * g

Running sola, I get the following expression, which I now evaluate with the value of the example:

l.'*((eye(2)) .* A*g + kron(phi.', A*g))

same for solb:

l.'*(kron(phi.', A*g) + (eye(2)) .* l)

ISSUES: I was expecting:

1. to be able to execute the sum in the parenthesis in the output of sola,
2. to have the same result of sola and solb after the evaluation but that is not the case.

What am I missing?