When I have WiFi enabled on my phone (Galaxy Note 9), I experience intermittent distortion on the Galaxy Buds2. It sounds like the bitrate drops and the treble starts to double up/stutter. This issue only occurs with the Scalable Codec, yet I have not had such a problem with my Galaxy Buds+ (except when gaming mode was turned on). The audio sounds fine when I'm using AAC on my phone, but I have to enable it in developer options every time I connect to my phone.
Perhaps the Note 9's Bluetooth modem is not well-optimized for the newer Buds2, but it's disappointing to see this issue between Samsung devices.
Before you ask, I've already tried factory-resetting the buds, clearing my Bluetooth cache and wiping my phone's cache partition. I find the best solution is to turn off WiFi which minimizes the issue, but it defeats the purpose of using them for streaming or watching videos.
After some further testing it seems my Buds+ is also exhibiting the same behaviour regardless of whether game mode is turned on or off. I never noticed this before so it is possible a recent software update or something else has triggered the probblem. It seems to me that the Bluetooth/Wi-Fi module of the Note 9 is unable to handle high bitrates of Samsung Scalable while using Wifi.