Airpods Pro not playing beginning of song and glitching

Hi, I recently got Airpods pro, but I have a really annoying problem with them. Most of time when I'm playing a song on Apple Music, the beginning of the song (~15 seconds) don't play. Once the song actually starts coming out of the Airpods, there's a crackling, glitchy, or broken up sound which then leads to the song playing as usual. Also, I 've been have an issue where sometimes the Airpods would straight up disconnect from my phone when I lock it and start listening to music! Lastly, sometimes when I press my volume button, from the button press to the audio level actually changing can be a 10-15 second delay and sometimes even when I try to unlock my phone, the screen just goes black and doesn't respond for 10-15 seconds. I don't know if this is because of me using my old iPhone 7 or something else but I have the latest version of IOS 15 and more than 5gb of extra storage.