Wow, you guys are great, I'm sure that if we all give it our best we can come with a way to kill it. Seems like that's what we're trying to do anyway....
I'm not saying the thing doesn't have issues but I'll wait for RIGOLs response before making up my mind about what to really think about it. Apart from the LM317 issue I actually like it so far, especially considering the price - it's $400 for crying out loud... And, it's not like they (RIGOL) are the first ones to have issues with devices in the field, it's how they handle it that matters IMO.
Anyway, for those who might be interested. I came back roughly 5 hours after leaving the unit with its outputs ON but no load connected. The outputs where still on so no reset here. Again, I'm not denying the issue, just saying that unit works fine with the lid on - only time will tell for how long.
So I set Ch1 and Ch2 in tracking mode, parallelled the ouputs, set the voltage to 22.25V and the current limit to 3.2A. Then I set the electronic load to pull 6.3A. Ch3 is loaded with a couple of resistors and is sitting at 0.8V @3.2A. It's been going like that for over an hour now. Case is cold, air out the back is barely warm. The e-load is getting warmer though....