I have two 4500s. Whenever a reboot/restart is performed they both hang. We find the device with a blank LCD screen, We have to manually power them down and then back on. A recent example was the firmware update from SFOS 19.0.0 GA-Build317 to SFOS 19.0.1 MR-1-Build365. On both appliances the firmware upgrade required a reboot, on both it didn't comeback on it's own.
This also happens by using the restart from the GUI.
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