Raid Roaming

Hi, have an issue with my EX4 (which I have booked with support). However, I am concerned it is terminal so was trying to confirm if the EX4 supported Raid Roaming? I have seen mention of Disk Roaming and Array Roaming but not actually Raid Roaming. Also, is this an industry standard (could I use a 4 bay QNAP for example)? The data on the disks appears fine but the NAS just continuously fails to work so am just looking to cut my losses and purchase another NAS. The blue lights never stop flashing and I can access the data but usually only for a few hours and can only gain access again if I turn the NAS off then on!!Thanks.

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