Hi mate. Heard a few things from new users of the XZ.
I'd recommend using Firmware 1.22 as it's been pretty solid for everyone including me as far as I can see.
1.22 Firmware has been removed from Pioneer's site (I don't know why, as 1.23 really isn't a clever firmware update causing more problems with WAV). You can get it from here: https://www.mediafire.com/file/fnifzbvlqo4z66g/XDJXZ.UPD/file?fbclid=IwAR1W9qo_7le5ZNpVGPzcJxqAMUK2Aj4IqXT9e5mZ9uj1dp66RdNNc7JrryU
Add this one file onto a USB stick formatted in FAT32 and make sure nothing else is on it.
DOWNGRADE INSTRUCTIONS
1. Press Reloop/Exit Button & Call X2 Button on Deck 2 and keep depressed while switching on unit.
2. Keep holding buttons down till unit fully loads up & tells you to insert usb stick in Port 1.
3. The Unit will now downgrade. After the downgrade has completed you will be told to remove usb stick and turn unit Off & Back On.
Next: Make sure you download all other drivers from Pioneer as needed here (paying attention to the model and software release of your computer):
https://www.pioneerdj.com/en/support/software/all-in-one-system/xdj-xz/#firmware-update
You'll be good to go after that.