Oasis B to Sony WH-900N aptX Stopped Working Suddenly

Hi! This is my first post here, and I have the Oasis B Transmitter that I use to use my Sony WH-900N Headphones with my Xbox. I have been using this transmitter for at least a couple of years with my headphones and have been able to get low latency aptX audio with an optical input from my Xbox. Recently I had to repair my headphones with the transmitter and now it seems that only the SBC Bluetooth code is being used... I don't know for sure if it was before the re-pair or if something changed during but I now get slightly distorted and crackly audio. I don't believe it is anything with my headphones as they still have quality audio with any other device/input, and I am using an HDMI audio splitter from my Xbox Series X but I have tested using the passthrough option on the transmitter to go from the splitter to my headphones and I get good quality through that as well. I factory reset the transmitter as well and no change, has my transmitters aptX just gone bad? I will try to find a micro USB that supports charge and synch to update the firmware of the Oasis according to the support section to see if this fixes the issue. I cannot find anything online except "what do the different Bluetooth codes mean" etc. so I was hoping I could get some answers/insight here. Thank you!