Consider the $N \times N$ matrix 

$$A_{\alpha}=\begin{pmatrix} \lambda_1 & -1 & \alpha & 0 & \cdots & 0\\ 
-1 & \lambda_2 & -1 & \alpha & \cdots & 0\\
\alpha & -1 & \ddots & \ddots & \cdots & 0\\
0 & \alpha & -1 & \lambda_{N-2} & -1 & \alpha \\
0 & \cdots & \alpha & -1 &\lambda_{N-1} & -1  \\
0 & \cdots & 0 & \alpha &-1 &\lambda_N   \\
\end{pmatrix}$$


The parameters $\lambda$ are defined such that the row sum or equivalently th column sum is equal to zero. 

If $\alpha \equiv 0$ this matrix is the discrete Neumann Laplacian and it is well-known that all eigenvectors $v=(v_1,...,v_N)$ of $A_0$ have the property that $v_1$ and $v_N$ do not satisfy a Dirichlet condition, i.e. $v_1,v_N$ are not equal to zero, see e.g. [here][1]

I conjecture based on numerical experiments that there exists $\varepsilon>0$, independent of $N$ such that the same is true for $A_{\alpha} \in \mathbb C^{N \times N}$ with $\alpha \in (0,\varepsilon).$


  [1]: https://en.wikipedia.org/wiki/Eigenvalues_and_eigenvectors_of_the_second_derivative#Pure_Neumann_boundary_conditions_2