file copying stops after a few seconds and drops to zero speed

running windows 10 64bit and latest drive pool version.

machine has separate drive for OS and i can copy multiple large video files from external USB and over network to this drive but when i try to copy to my drive pool drive array from network or USB then runs for maybe 20 or 30 secs, drops to zero and seems to freeze. Drive pool interface then wont open up and machine seems to partially lock up and i have to reboot from power switch.

any help appreciated

log file attached

last file to stop was banshee s1o1 and stopped with reading of 355KB