Moto x4 XT1900-1 not entering fastboot - Android Q&A, Help & Troubleshooting

I recently purchased a refurbished Moto X4, which shipped to me as a hard brick a month ago.
The device would not vibrate, or enter fastboot mode for a recovery option when holding down power + volume down.
After downloading the Motorolla USB drivers, I was finally getting windows to chime when the device was being plugged in. Windows did *not* recognize the device as a Qualcomm USB device. It would just chime, and nothing would show up in device manager showing a USB device. Just a chime.
Through some miracle, running a blankflash.bat file while holding down the fastboot buttons, after installing ADB eventually got me to a fastboot menu, from which I could restore the phone to factory settings and use it.
That worked for about a month.
Now the phone is hard bricked again, with the same symptoms as before (No fastboot; no recognized Qualcomm USB device), and now blankflash gives me the following errors when I try to use it to get me to fastboot:
**** Log buffer [000001] 2019-05-22_19:31:05 ****
[ 0.000] Opening device: \\.\COM5
[ 0.003] Detecting device
[ 0.006] ...cpu.id = 172 (0xac)
[ 0.006] ...cpu.sn = 518110791 (0x1ee1be47)
[ 0.006] Opening singleimage
[ 0.007] Loading package
[ 0.009] ...filename = pkg.xml
[ 0.011] Loading programmer
[ 0.011] ...filename = programmer.elf
[ 0.011] Sending programmer
[ 0.215] Handling things over to programmer
[ 0.216] Identifying CPU version
[ 0.216] Waiting for firehose to get ready
[ 3.235] ...SDM630 1.0
[ 3.235] Determining target secure state
[ 3.237] ...secure = yes
[ 3.272] Configuring device...
[ 3.279] Flashing GPT...
[ 3.279] Flashing partition with gpt.bin
[ 3.284] Initializing storage
[ 4.463] Target NAK!
[ 4.463] ...ERROR: Failed to open the SDCC Device slot 0 partition 0
[ 4.463] ...ERROR: Failed to open the device 1 slot 0 partition 0
[ 4.463] ...INFO: Device type 1, slot 0, partition 0, error 0
[ 4.463] ...WARN: Get Info failed to open 1 slot 0, partition 0, error 0
[ 4.464] ...ERROR: Failed to get device info slot:0artition:0
[ 4.464] ...GetStorageInfo Failed - storage_device_get_info() returned FALSE
[ 4.464] ...ERROR 14: Line 1283: HANDLE_STORAGE_INFO_FAILURE
[ 4.465] ERROR: do_package()->do_recipe()->do_flash()->flash_simg()->do_package()->do_recipe()->do_flash()->gpt_flash()->get_storage()->init_storage()->firehose_do_fmt()->do_recipe()->NAK
[ 4.465] Check qboot_log.txt for more details
[ 4.466] Total time: 4.468s
[ 4.466]
[ 4.466] qboot version 3.86
[ 4.466]
[ 4.466] DEVICE {
[ 4.466] name = "\\.\COM5",
[ 4.466] flags = "0x144",
[ 4.466] addr = "0x62FD64",
[ 4.466] sahara.current_mode = "0",
[ 4.466] api.buffer = "0xEC5020",
[ 4.466] cpu.serial = "518110791",
[ 4.466] cpu.id = "172",
[ 4.466] cpu.sv_sbl = "1",
[ 4.466] cpu.name = "SDM630",
[ 4.466] storage.type = "eMMC",
[ 4.466] sahara.programmer = "programmer.elf",
[ 4.466] module.firehose = "0xFFEAB8",
[ 4.466] api.firehose = "0xFFEF20",
[ 4.466] cpu.ver = "256",
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Has anyone else experienced this? Or can anyone explain to me what tools to use and what they do? I am very new to this unbricking process.