Quoted from rai:My TNT targets sometimes go down without even being hit, sometimes just when the ball is placed in shooter lane. Often will register as hit just by shaker motor or randomly. ... Any thoughts?
Sounds like your targets aren't resting enough on the "ledge" piece that holds them up and are therefore essentially set on hair trigger. Ideally, just adjust their position so that they catch more on this ledge. Check to see that the catch edges on these pieces aren't overly worn also. If so, you can sharpen by filing/trimming or just replace if really bad.