Solutions
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FearlessAttempt's post in System becomes unresponsive during data rebuild of 2 disabled drives was marked as the answerSo it ended up being the HBA causing the issue. Not sure if its overheating or what. Did have a fan on the heatsink. Replaced it temporarily with some pcie sata cards until I can get a replacement. Thanks to itimpi and JorgeB for taking the time to check my logs and point me in the right direction.