Readynas 104 drops out when copying to it

I have this issue as well on a RN104 with 4*4TB hard drives a which was 75% full. This happened when trying to copy from a USB drive attached to the unit. Moving the USB drive onto another RN104 on the network strangely allowed the copy to the original unit to occur without dropping out.

I have had this issue with my NV+v2 units which was rectified by formating in ext3 until Netgear released firmware 5.38 after 9 monthsleased, factory reset required and associated backup and recopying back then I mistakenly installed the beta firmware 5.3.9 which replicates the original issue. which requires rolling back but also a factory reset etc. To facilitate this I had to get another NAS which a 104 but hit this issue again is a slightly different form. As Muer states there is a high number of processes going on after the NAS gets about 75% full. This seems is related to the linux kernel that Netgear uses and seems to be an issue in the NV+ v2 and strangely is showing now in the 104. I have had 3 cases on this with Netgear one closed by firmware 5.3.8, one was closed without my agreement as the issue is not solved and another is now open for the 104. However I hold no great belief that Netgear have a handle on this issue. One statement from support was "take some files off the unit to allow file transfer". The Unit was only 75% full and it was an 8TB RAID unit