Add a threshold for bad solve statuses before reset

Even though bad solve statuses are usual because sometimes it is hard to
solve for the waypoint, there could be cases where it is impossible to
solve for a waypoint for a certain transition list (although we try to
ensure that the solver should have a positive probability of solving
it, by analysing the optimization problem in an earlier step). Adding a
threshold to it would ensure that the solving step does not take an
exponential time to decide that a transition list is not suitable.