Bar chewing

[BThuringer]

Zeus, my 3 month old Syrian has developed the a habit of chewing bars recently, which has been making me quite worried as I know that it can be harmful and also means that he is bored/stressed.

He has plenty of chews and treats all around his cage which he uses, so I know that he has plenty of options and he shouldn't feel that he needs to resort to chewing his bars. He has a large cage (95 x 57 x h 50 cm) with multiple tiers, so there is a lot of space to play and explore. He also has a wooden wheel (28cm diameter) which he uses every night. I always scatter feed him and provide extra enrichment such as puzzles when he has time out of the cage. I also recently bought new climbing frames and tunnels for his cage when I was worried that perhaps it could be due to boredom, but he still continued to chew his bars.

Does anyone have any suggestions about what might be causing him to chew his bars? It feels like I've tried everything (and have spent an awful lot of money) but still come back to the same result, and I hate the thought of him being stressed/unhappy.