This is not a bug but a general support issue, next time please use the general support forum.
You're having USB issues, and not just with the flash drive:
Aug 26 04:17:00 LaptopUnraid kernel: usb 3-2.4.4: USB disconnect, device number 6
Aug 26 04:17:00 LaptopUnraid kernel: usb 3-4: USB disconnect, device number 3
Aug 26 04:17:12 LaptopUnraid kernel: md: disk1 write error, sector=128
Aug 26 04:17:12 LaptopUnraid kernel: md: disk1 write error, sector=136
Aug 26 04:17:12 LaptopUnraid kernel: md: disk1 write error, sector=144
Aug 26 04:17:12 LaptopUnraid kernel: md: disk1 write error, sector=152
Aug 26 04:17:25 LaptopUnraid kernel: xhci_hcd 0000:05:00.4: xHCI host not responding to stop endpoint command.
Aug 26 04:17:25 LaptopUnraid kernel: xhci_hcd 0000:05:00.4: USBSTS: HCHalted HSE
Aug 26 04:17:25 LaptopUnraid kernel: xhci_hcd 0000:05:00.4: xHCI host controller not responding, assume dead
Aug 26 04:17:25 LaptopUnraid kernel: xhci_hcd 0000:05:00.4: HC died; cleaning up
Aug 26 04:17:25 LaptopUnraid kernel: usb 5-1: USB disconnect, device number 2
Aug 26 04:17:25 LaptopUnraid kernel: sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 cmd_age=0s
Aug 26 04:17:25 LaptopUnraid kernel: sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 03 31 b0 00 00 20 00
Aug 26 04:17:25 LaptopUnraid kernel: blk_update_request: I/O error, dev sda, sector 209328 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 0
Aug 26 04:17:25 LaptopUnraid kernel: usb 5-2: USB disconnect, device number 3
USB for array/pool devices is not recommended, for the flash drive try another port, ideally a USB 2.0 port.