Readynas 104 drops out when copying to it

Same issue here. 104 with 3 WD red 3tb drives. Started locking up with more than 70℅ full. Interestingly, this did not happen with just 2 drives in it. Both WD red 3tb drives. Filled them up to 95℅ full without a problem and only then added the 3rd drive. So the issue seems indeed to be related with the filesystem and how it is set up. Downloaded the logs and noted that the 104 was frantically deleting snapshots whilst freezing. Now wondering to either wait for the update to the new firmware our just to sell this disappointing piece of crap. ( the write speed dropped dramatically after adding the 3rd drive; the system is too underpowered to handle 3 drives or more) bought the 104 as I was quite happy with my old trusty duo v1.