I am having a similar problem with WhatsApp, and believe it is a notification issue within Pie. For some apps I use a notification reminder "Prof Reminder / Missed Call Reminder" where I can set the notification sound and repeat duration. With WhatsApp I get the initial notification sound, but no repeat, but with BlueMail (email client) it works perfectly. Have checked all the permissions and settings many times, and all seem to be correct. Has anyone else had this problem, as with the previous version of Android, 8.1, it worked perfectly well. Maybe it is an issue with the doze control, or something similar.
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