I was reading up on them a bit and it seems the design I have (alternistor) is specific in that it will only operate in 1-3 quadrants so it has improved turn off ability. I guess false triggering is a common issue for these.
I will have to do more reading.
However, I believe I have a Q4025P, rated at 400V. I was going to just replace with a higher voltage rating like I might do with a diode or mosfet but in my reading, it almost seems that a higher voltage could cause a change in turn on/off characteristics and may need retuned for the circuit?