I'm able to address this problem by tweaking USB port power options. Follow these steps & it should fix your's,

1) Plug in moonlander 2 to the computer.
2) Open device manager on windows machine.
3) Under USB controllers identify the USB port to which the moonlander 2 is connected to.
4) Right click that particular USB port & select the properties.
5) Under the last tab 'Power Management', un-check the option of "Allow the computer to turn off this device to save power".
6) If possible restart the computer & try again. It works for me.

Hope this helps...Happy Mining

I have got my moonlander 2 & facing couple of issues,

I have connected the USB device to my laptop with clock set to the lowest frequency ("--set MLD:clock=384"). I'm using the low frequency setting until i get my new USB HUB. The issue is the hashing stops/halts after running for few minutes. Below are the two cases i have observed.

case 1:
hashing stops/halts when it encounters "stratum connection to pool 0 interrupted". I have waited for almost 30 minutes after this last message in my screenshot & it never progressed.
https://imgur.com/rpn2Fre

Please help me if I'm missing anything here or to tweak anything to make it run continuously without restarts for every few minutes.

Thank you.  

Yes, this is the problem I mentioned above. As Carlo said, it's not flawless on older R9 cards, specifically Pitcairn (78xx and 270) and Tahiti (280X, 79xx, etc.), I do find it works fine on the 285/380 (Tonga GCN 3rd series). 10.2 is important as my cards run a lot cooler with less power, but that might just be because they're churning out rubbish. I might rebuild my rigs and put all the older cards in one rig running 9.7 and all the newer, stable stuff into another and run 10.2 - sounds like a great plan but I bet I'm more likely to end up with everything broken...

r9 series need to stay on 9.7, they bug on 10.x   except the 390

Agree, I didn't find the way to work 10.x with older cards.

Usually this occurs due to the intensity.

what are your command line in the miner &?

Are you overclocking ?

Had such happiness with one card. In my case, solution was a significant drop in temperature. Probably some radio elements lost characteristics with age and at high temperature becomes unstable.

At first, I need to say your rig is complete mess.
It means when some connectors passing to each other, it doesn't mean you can connect them together.
Just one question at start, did you tried to power up rig with only two cards?



Have you tried to do this with both psus? To ensure both psus are working?
This is main and basic thing to know. If so, you can continue further.
I was running similar setup 4x r9 280x with two corsairs 750W and 650W connected through add2psu.
Previously it was working with shorted green-black too. This setup was working for me even without powered risers.
And it wasn't necessary to hang some hdd, or dvd-rom to second psu, it was working without that.
So, in your case, I would do this. Unplug all those reduction molex/8pin cables which are powering gpus.
Then straight connect you gpus with 6+2 pcie cables, and I mean plug both sockets to gpu. That cable is builded for that.
I would connect 2gpus per psu for balanced consumption and best efficiency. 860 mobo+gpus+hdd, 760 gpus.
Then unplug that reduction sata/molex which is comming from first psu to add2psu.
Connect this through straight with molex connector, connect it with closer molex.
For power up risers, now you can use those sata/molex reductions, if you don't have enough molexes.
Same in here connect it with closer connector possible. Don't worry you can connect one hdd from one riser.
Connect gpus and risers from same psus. Then turn second psu on, then first on. Press power button,
and if all of your hardware isn't faulty, it should run now. But as you stated before, you said,
that you burned something, it means even if you have proper cabling now, it's not guaranteed it will work.
So try this, and I hope it will help.

I don't know about that video, but i use first psu to powered 3 usb risers and 3 cards, and secont PSU to powered more 3 usb risers and 3 cards, and rig working fine more than a 3 months.

Power Gpu + Riser with same Psu, if you do diferent them this i ill have problems,

All of my 7 rigs are using 3 Psu each, 1 for mobo + hd , and 2 750w for the Gpus

The USB risers are power-isolating in the sense they do not have power lines from the motherboard - power is only from the child-side riser power. The idea that you should use the same PSU for mobo and risers is TOTALLY backwards for USB-type risers - it's old info from non-cut/non-powered era. You're better off using the same PSU for a given riser/GPU, since what is the riser really doing here? Powering the GPU... why would you choose to power the GPU with multiple PSU for no reason?

How do you ground 2 PSUs together? Use a dual PSU cable (e.g. power-on lead and ground y-connector), or run any ground lines between the 24pin

I have a few USB powered risers. I tested it. The +12V is not taken from the motherboard, it is only from the SATA +12 connector. So you can connect it to either main or the secondary PSU.

It might not be your solution but at the very least you should be only using powered USB risers exclusively.

Try to add some old HDD to the 2nd PSU, so it will draw power no matter what happens with the GPU. It worked for me.

I have 2 psu rig, and working fine. Try to powering 3 risers and 3 cards with first PSU, and 3:3 with second. Don't cross riser and cards with both PSU's.
Sorry for my bad english, i hope you can understand me.

NOTE: Ensure one PSU is used for the Motherboard and ALL connections (molexs/sata power connections/ & any other non-GPU connections) The Second PSU should be ONLY used for powering the extra graphics cards ONLY, just the 12v rail connections.

DO NOT USE THE SECOND PSU to power any of the risers...this will create a weird loop back through the MB and potentially nuke it.

As far as I know you'd need something like this:

http://www.thermaltake.com/db/products/PSU_Cable/Dual_PSU_24Pin_Adapter/main.jpg

To turn both PSUs on at the same time.