Zwave - dead note

i installed a kwikset 910 (zwave) to my rpi4 with a HUSBZB-1, ver 0.115.6 the lock seem to work for a few hours then no response, i reboot and the lock shows to be dead how can i fix this
my config:
zwave:
usb_path: /dev/ttyUSB0
network_key: “0x2e, 0xcd, 0xab, 0x1c, 0xa3, 0x7f, 0x0e, 0xb5, 0x70, 0x71, 0x2d, 0x98, 0x25, 0x43, 0xee, 0x0c”

my ozw log:
Error, Node008, ERROR: node presumed dead
i uninstalled and reinstalled a few times and the same thing happens
please be ez on me i really dont know this as was well as it my seem
thnaks for your help jeff