Game stops connecting players mid game play

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The game is made LIVE 15 days back. Since 2 days we are experiencing an issue that every game play gets terminated due to players disconnection.
We are using 20 CCU pack. To analyse the issue, we checked our CCU and MAU as well. But total registered players are only 219, total games played are only 1015 and CCU as shown on Photon dashboard is 8 max.
Please suggest if this is the case of CCU burst or what technical issue.