You haven’t provided a reproducible example, i.e., with input data, which would allow us to investigate.
I recommend you remove the quiet option, so that the solver output and the Status and Optimal value returned by CVX will be displayed. My guess is that when SINR > 1e-10, your problem is infeasible and you will the see the following:
Optimal value (cvx_optval): +Inf
In such case, the optimization variables would all be NaN
After you have CVX and the optimization problem solution running smoothly, then you can consider using the quiet option.