During this process, if your node address changes, your rewards are calculated afresh from the date of your new node staking. And, if your node address is not changed and remains the same as the old node's address, then there is no impact on your rewards.
Important Note: If a member has a staking reward day on the 15th day of each month and if the member unstakes on the 10th day and does rebuild, restake, etc., then the reward on the 15th will not be given, instead the reward will be calculated from the 10th day onwards. So you might be missing 25 days rewards.