(a) It is a ground for removal from the board if a board member:
(1) does not have at the time of appointment or maintain during service on the board the qualifications required by Section 1001.021;
(2) violates a prohibition provided by Section 1001.021;
(3) cannot discharge the member’s duties for a substantial part of the term for which the member is appointed because of illness or disability; or
(4) is absent from more than half of the regularly scheduled board meetings that the board member is eligible to attend during a calendar year, unless the absence is excused by majority vote of the board.
(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 board member exists.

(c) If the executive director of the department knows that a potential ground for removal exists, the director shall notify the chair of the board of the ground, and the chair shall notify the governor and the attorney general that a potential ground for removal exists. If the potential ground for removal relates to the chair, the director shall notify another board member, who shall notify the governor and the attorney general that a potential ground for removal exists.