What device are you running this on? The W5500 has an actual reset pin that could be toggled so that could help?
Yes, the reset pin can help this issue. Or restart the power of the device can also reset the W5500. But this issue will happen in a few minute again.
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
What device are you running this on? The W5500 has an actual reset pin that could be toggled so that could help?