It could be the beginning of eMMC problems for your car. That's why you need to watch from the list for anything else. You might not see any new or a different problem until your second update from now. Its going to take some reading to understand. But I will try to give you a short version. I did eMMC failure tracking for S/Xs reported on TM and TMC for 15-16 months. Gathers some interesting info. Most common failure was 2015 cars.
The eMMC is storage. The firmware is stored on two firmware partitions on the eMMC. One is active where your car reads the code from to start each time or each time its rebooted. The other partition is inactive and currently holds the last firmware update - something you had before 2020.48.37.1. The active partition flips/flops between the to active and inactive partitions as one becomes the current with the latest firmware.
Your current .48.37.1 could be sitting on eMMC bad spots where the code (sound stuff) can't be completetly read from. Its likely to stay that way until you get another OTA let's call this one .38.0 . When it downloads and installs, is going to make that inactive partition active and reboot the car. When it does the firmware will not be in exactly the same place on the (inactive now) soon to be active partition. So, sound stuff could be (likely be) a different location and the car can read the code okay, and it works. But code could deliver to some other bad spot and something else might not work. So an OTA (38.0) could fix your problem. But that also means, the next OTA let's call this one 39.0, could break something else. Because now you have circled back to the same partition with this 39.0 install that you had the sound problem. Unlikely that sound stuff would deliver to the same place that it was way back with 37.1. So same bad spot are there, but some other code is in that spot and something different doesn't work.
Not the best explanation, but I am running out of time before I have to be somewhere. Sorry. Hope you get a basic idea. A different problem could occur after your next update. And if the problem is your eMMC, this problem is not going to get better with time. In fact, it will get worse with time.