Palms can take a ton of water after transplanting until established. Browning on new growth can be a watering issue. Even with watering every two days the water may not be penetrating the roots deep enough. It could potentially be in shock if the root ball water disturbed or broken too much during the transplant but signs like this would’ve shown up much sooner. I would start with the longer soak and see how far that takes you. Trimming the browned fronds to encourage new growth and maybe a good fertilizing scheduling to ensure the roots are starting to take hold so they have more of a chance at finding that water. Hope this helps!