Connection problem with headphones to ipad

Hi, Ive been using Bang & Olefsen e8 earbuds and h9i headphones for several months without a problem. Recently neither will connect to my iPad 7th generation.

I’ve tried re-pairing, “forgetting both devices, resetting my ipad , nothing works.

Sometimes on Bluetooth the ipad will bring up the device , like h9i appears but then disappears and I have to go through the whole set up again. Can anyone help? Thanks