Quoted from SDTMinSTL:
Can't help on the first one, but I can on the third.
Stern's ball trough rollover switches can sometimes not register due to a sticky or stiff switch. Generally, a simple adjustment to the rollover leaf will allow the pressure of the ball to make more constant contact. This can show all the time, or more typically in a scenario where the ball slowly falls in the trough and doesn't have the inertia to activate the rollover. I would bet it is the last switch to the left in the trough. It is simple to get to. Worst case scenario, you could put in a new switch. Some of them just inherently have more resistance and require some adjustment. I had this same issue with my Walking Dead and it now functions just fine. Best of luck.
Had the same issue with my AC DC Vault Premium. Replaced two of the stiff switches after trying to adjust them. The stiffness just caused the blade to bend more, each time I adjusted it. Ordered 6 new switches and chose the softest two. No more problems