I don't really trust Seagate, could it be one of the hard drives?
Seagate has nothing to do with it. You should NEVER use RAID 0 as primary storage like this.
That's just begging for data loss.
It's very likely that you've got an unstable drive, but that is to be expected because drives all fail eventually, some earlier than others.
If you've got a backup, or you're not backing up this data or don't need what's there now, run Seatools to identify which drive(s) is unstable and replace it.