Airpods stop working with my phone

I have had my fairphone for about a year and a couple of months ago I got a pair of AirPods. They worked fine at first but after about a month the volume wouldn’t go above just hearable, even if I put it at full volume it sounds like it’s at half volume, and at half volume you can barely hear anything. The thing is the AirPods still work with all other phones than mine. I traded AirPods with my friends since they still work with her phone, but after a month her AirPods had the same problem with my phone as my old AirPods had.
My phone still works with all other Bluetooth devices.
Does anybody know why this is or how I can fix it?

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