FCM Push Notifications not being received on some Android devices


We are using the latest version of the Push plugin for notifications and when we test the application on a range of test devices (Android 5, 6, 7 and 8) they work all the time. Many of our users though (particularly Android 7 and Android 8 users) are reporting that they are not receiving notifications. Does anyone have a similar experience? I am in the process of trying to contact a user so we can monitor token creation and notification send logs on the server but wondered if anyone has had similar issues with the plugin?