Motors suddenly very weak

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Something very weird happening here. I have been using my MPCNC for over a year with a PC/Windows 10/GRBL/UGS.

I tried to connect my MPCNC to a macbook. Since then the motors are working very weakly and almost not moving at all. I reconnected the MPCNC to my PC but it has the same behaviour. Any ideas how to debug? I checked a lot of things already.

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SOLVED! - I updated the grbl to the latest version and it worked again!

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That is a strange fix for this problem. Based on another topic, my primary suspect was the power supply, so if you have problems in the future, that would be the first thing Iā€™d check.

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thanks for your response