Hello,
Thank you for reaching out to us here on the forum.
Based on your description I believe that you are not using a DisplayLink powered device so the driver will not be any help here with your issue.
What I may recommend here is to verify if the DP adapter that you are using is able to transfer such amount of data as 4K@60 is a lot. Next, I would take a look at the monitor settings. They may be an option to change it physically as for example a wrong input which causes the refresh rate to change.
Nevertheless, I would also verify the monitor with another laptop just to double check that.
I would also recommend asking and looking for answers on the Apple forum as you may get more help over there concerning your Macbook capabilities.
Best regards,
Jakub
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