VIAVI TestCenter: After 5-6 hrs of operation on an SPT-N4U my test disconnects and can I can no longer connected to the chassis

The chassis seems to be unstable as the following happened twice in one day. • After ~5-6 hr of operation, Spirent TestCenter complained that it can not connect to the chassis • The Android OS on the control panel of the chassis seems to be corrupted (all buttons give error messages) • Restarting the Spirent TestCenter GUI and replacing Ethernet cable made no difference • Unable to ping chassis (did not try to ssh to it) • We can not reboot the chassis at this point by pressing power button without holding for some time • If we press and hold the power button for some time, we can shutdown the chassis • When we start the chassis but after that it will never connect via the Spirent TestCenter software (after waiting for 45 min) • Since the power button now responds (and OS seems to fine) we can reboot without holding the power button • Then everything worked find (~5 min booting time) until randomly break again....  

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