ipad pro 4th gen bluetooth unavailable

My son’s 2020 iPad Pro has started to disconnect Bluetooth and the bluetooth icon in the top right drop down menu is greyed out. Only fix is restarting. iOS is up to date. Never had this issue with any of our devices before. I have the 2022 iPad Pro and don’t have the same issue. Anyone know if there is a software issue or how to fix it??

[Edited by Moderator]