1.5.0.8 breaks USB Drives

I've been happily using 2 Seagate USB 3.0 drives, one 4T and the othe 8T NTFS formatted drives, with the r9000 until firmware 1.0.5.8.  This firmware will only let me copy approximately 4G of a file to the drive before the OS (Windows 10 Pro) tells me that the file is too big forr the destination.    I finally set aside some ltime yesterday to toruibleshoot the issue and discovered that downgrading the firmware to 1.0.5.2 resolved the problem. My drives are not on the supported list so I do not expect any reaction from Netgear but I fear that I may be on 1.0.5.2 for the life of the drives or the router, whichever ends ffirst.