Phone doesn't use selected ringtone by some incoming calls

Hi,
since I updated to version 18.01.1 my phone doesn’t ring with the selected ringtone. It use any ringtone for textmessages - I guess - so the chances are high to miss a call.
But it doesn’t do so with every call. It can be, that only outlook-contacts are affected. Haven’t been able to test this theory properly so far.
Does anyone have a clue, what I can do?
Thanks,
Nicole

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