I have noticed the GS150 runs cooler than ref.6 with fans running at high speed on the GS.
Also found the cause of Ref.6 shutting down. One of the item on the menus is auto shutdown - and it was set at 2 hours. So every 2 hours it shut down making it look like a thermal shutdown.
I have limited space on the rack - so need some suggestions for the cooling setup for ref, 6.