0's turn to x's
that is most likely some problem with your power supply. if you want people to help you need to provide more details, not just I changed settings and it happens.
you need to weld 2 mm wires to those wires on your power supply and use those two wires to connect to blade. for example if you cut 6 wires 3 yellow and 3 black from PCIe connector. then make a two bundles of 3 wires in each and weld it to your 2 mm wires, which goes to blade. Also, normally I would not connect anything to blade without checking voltage first.
Cooling for blades running on high clock is important too. for two blades, two high speed 140mm fans will work fine, with blades placed vertically in small PVC pipes rack.
If it all fixed properly you will have no problem with running it continuously with no headache at all. My blades restarted last time 17 days ago.