Without limitation of a right or defense of an insurer otherwise, none of the following acts by or on behalf of an insurer constitute a waiver of a provision of a policy or of a 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 to it, or for making proof of loss, or receiving or acknowledging receipt of forms or proofs completed or uncompleted;
(3) investigating a loss or claim under a policy or engaging in negotiations for a possible settlement of the loss or claim.