Hi,
I finally bought the official/authentic power supply vs. a generic one with same voltage/current I was using temporarily.
However, now every time the connector on the synth gets bumped, the synth briefly turns off/on again. 
I verified that it's not the cable, because I can move the cable around as much as I want if I hold the connector steady.
I did notice it's about 2mm longer than the hole, so it sticks out a bit - but that's not quite uncommon.
Is this normal? Do they all do this? The problem is that a slight bump, and I lose the TI2 power. I'm worried about gigs, a tiny cable pull or something and big embarrassment. 
I checked my other synths, and they don't do this. 
Maybe the hole for the centre pin is too big? So it's okay while resting, but a movement can make it lose connection.
Basically I want to check whether this is a known issue and happens to others, too? Thanks. So far searches haven't found anything.