Anyway I was in contact with seller and they sent me picture which contact of relay I should shortened.
Problem solved, safety decreased but hashing...for now.

Care to share that information and image?
OK...I hope now it will work...imgur and inserting images here is killing me.
Image:
http://i.imgur.com/9eMElsi.jpgBest regards
How would one Short these two pins? Wire and electric tape or a solder job? I ask because I have no solder experience. Thanks!
Take soldering iron and put it to both pins same time till it melt. Same time you add some soldering wire and you will get little soldering bubble which will connect both pins. No need to add any other things (copper wire, tape....). It worked for me and now Cube works without interruptions.
But think about other possibility: maybe you have PS which can not provide enough current to your cube. Because of that voltage drops and relay K1 begin to 'buzz'.