Leo problem?

Hi. I have an 11 year old male Leo. He recently (over the past 3 months) has kinda gone off his black crickets that he usually scoffs.
At the moment he hasn't eaten a black cricket for 2-3 weeks. he fat and healthy and runs about a lot and likes a warm bath. I have give him some wax worms just to check if it was impaction
and he poo'd it out fine. He scoffs them as soon as he sees them. I don't no whether he is just bored of black crickets or there is something wrong with him. He hasn't started to loose weight but like I said he has a nice fat tail still and moves around regularly and he comes out his tank often. he doesn't seem to be showing any signs of discomfort or unusual behaviour apart from the eating? When he sees a black cricket he gets exited kinda goes for the kill.. then slowly nudges it and it runs off? Sometimes they run past and he just isn't arsed at all. I thought it may be eye sight but he sees the wax worms instantly and decks them. Any help would be appreciated.

If he's happily eating the wax worms, it doesn't sound like anything is "wrong" with him. Perhaps try a healthier worm type, such as mealworms or silkworms next time (give him a few days) and try again. If he goes for the mealworms happily, you shouldn't have any problems with his long-term health. Maybe just like people they get tired of the same old thing all the time, and eventually he'll happily gobble a cricket again after a few months of mealies.