How big is the tank? Does it have any hiding spots like plant foliage? Lots of hiding will help make the frog feel secure.

Aim for body length of the crickets to be about the space between the frogs eyes. You can try chilling the crickets down for a few seconds in the freezer or a few minutes in the fridge then dropping them in front of the frog if it was having trouble catching them. Or try putting them in a small glass bowl to limit their movement inside his regular vivarium, that way you don't have to disturb him for feeding.

I find waxworms get ignored unless they move with great haste (relative to waxworm speed) or I poke them around with tweezers. Waxworms should also be used as a treat, not a staple part of the diet. You can also try letting them pupate and turn into moths and feed the frog moths. If your frog doesn't go nuts for a moth flapping around, there's definitely something wrong.

If it was outside up until a few weeks ago, it was probably on it's way into hibernating, this might have put it off food.

I don't find mine terribly sensitive to the lighting conditions, but you could try have them on at the same time from day to day.