M4a files playback too fast in WL Pro 12

When I open an m4a file recorded mono in 48 kHz with an iPhone, the playback in WL 12 is Mickey Mouse like too fast. When I open the same file in WL 11, everything is fine. Any idea??
Thanks, Holger

Can you share this file?

Thanks for your reply, PG. Of course I can share the file but I don’t see a button for uploading it to somewhere on the Steinberg server. Sorry for asking such basic stuff…

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