AirPods

when I use my airpods, the right pod drops bluetooth connection after about 5 minutes of use. The left remains OK. When I re-sync, everything is ok for a short time again. Any suggestions I have 2 sets of AirPods and both do exactly the same, I have tried unpairing and re connecting them with other devices and they still do the same thing, they have plenty battery life still in them, very frustrating :(