I just upgraded a stunt saber to sound using a NBv2, header and wiring harness, with a PEX and AV with LED switch. All seems to be good to go except:

In dueling, a hard hit (blade to blade) causes the saber to power off. The saber will power on again with a press of the activation switch. I actually suspected the battery to shake loose, but I secured it with electrical tape only to have it still power off. Is this a normal function of the NB or do I have a loose wire somewhere?

Thanks.