We have TWR-LS1021a with Rev1 CPUs which we run our automated CI software regression tests on. The uart is accessed on USB via the onboard K20 mcu running mBED firmware. Every few days, the serial-port crashes the USB hub or Host PC root port and serial console breaks. Sometimes re-plugging the board will fix it, however often a full hardware reset is required. There are lots of other USB_serial converters we use continuously for months, the TWR is the only one that crashes.
Are there any firmware updates to increase the reliability of mBED USB serial on the TWR-LS1021a ?