Hi @soundlover , I'm sorry to hear that your second SoundCore 2 still have audio fluctuation issues. We do take our quality control very seriously with numerous and rigorous checks in place so for a customer to receive a defective product is an unusual occurrence, but to hear of a single customer receiving two items that don’t perform to our high standards is very rare indeed. We will forward the details of the case straight to our quality control team so they can be made aware of the situation.
However, if you suspect a replacement would have the same issue, I would suggest you to choose SoundCore boost, you can check the review on amazon to learn more, also here are the video review for SoundCore boost, which made by our community members. Hoping all these things can help you make a good decision.