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Thanks for the great and quick reply.

That explains a lot!!

I forgot to tell that this is done on a Teensy 3.6.

The example sourcecode is on Github examples/TimeTeensy3/TimeTeensy3.ino

As you can see, I added some test code to the existing example TimeTeensy3. With test set to HIGH you can see that the clock doesn't advance beyond 5 minutes or so.

With test set to LOW the clock...