My left air pod doesn't work properly especially when it in the case And the lid it’s flashing all the time but after I remove the left one from the keys in it showing on my iPhone but when I put it in the case it doesn’t appear I cleaned my Case

My left air pod doesn't work properly especially when it in the case And the lid it’s flashing all the time but after I remove the left one from the case it showing on my iPhone but when I put it in the case it doesn’t appear I cleaned my Case several times and I disconnected and connected several times but no hope and it doesn’t work well till the moment so what can I do to make it work well? Thank you