(a) It is a ground for removal of a director from the board if the director:
(1) did not have at the time of appointment the qualifications required by Section 366.251(e);
(2) whether at the time of appointment or at any time during the director's term, is ineligible under Section 366.251(g) or 366.252 to serve as a director;
(3) cannot discharge the director's duties for a substantial part of the term for which the director is appointed because of illness or disability; or
(4) is absent from more than half of the regularly scheduled board meetings that the director is eligible to attend during a calendar year.
(b) The validity of an action of the board is not affected by the fact that it is taken when a ground for removal of a director exists.
(c) If the administrative head of the authority has knowledge that a potential ground for removal exists, that person shall notify the presiding officer of the board of the ground. The presiding officer shall then notify the person that appointed the director that a potential ground for removal exists.