Good chance the error was a CRC error which indicates a connection issue caused a failed transfer initiating a repeat, Chances are you changing canoes has resolved the issue. Since CRC errors are recorded on the drive and never rest to 0, if you click on the thumbs down symbol and select Acknowledge from the displayed menu Unraid will only warn you again if the value increases. Occasional CRC errors are nothing to worry about but if they occur regularly you want to look into it as they slow down transfer speeds.