Without limitation of any right or defense of an insurer, none of the following acts by an insurer shall be deemed to constitute a waiver of any provision of a policy or of any defense of the insurer thereunder:
(1) Acknowledgment of the receipt of notice of loss or claim under the policy;
(2) Furnishing forms for reporting a loss or claim, for giving information relative thereto, or for making proof of loss or receiving or acknowledging receipt of any such forms or proof completed or uncompleted;
(3) Investigating any loss or claim under any policy.