edgood

Hi everyone, I have a new Advancedgrind cordless angle grinder which uses an angle grinder clamping nut to secure discs. When I stop the grinder the disc and clamping nut fly off! This is rather disconcerting to say the least. I have carefully followed the instructions in the manual and have so far only tried it with a flap disc. I have contacted Bosch, but no response yet. I can only think that the angle grinder locking nut is faulty - is this likely to be the problem? Has anyone else had the same issue? Looking forward to hearing from you.