Jam has stopped climbing and I have no idea why!

[Pompompoms]

Hiya,

One of my Robos Jam who is now five months old, has suddenly over the last week stopped being able to climb. I have no idea why as it's never been a problem for him before. He's in a rody cage so his food is on the platform at the top of his ramp, his mineral block is up there too.

He usually loves climbing so much that he ignores the ramp and just climbs up the side the hard way, he tries to, but he can't, he can't climb the ramp anymore either. The only thing that seems different having watched my other Robo The Cloud climbing, is that Jam doesn't seem to be able to reach with his arms anymore, he can't stretch forward which he needs to be able to do for climbing

Other that this he seems absolutely fine, he wheels, goes in his tube seesaw, has baths ect. he comes out and runs about all over me no problem. I did when he was laying down on my arm for a stroke give him a gentle sqeeze all down his body to see if he was in any pain, but he doesn't seem to be.

I'm baffled, he does try, but he can't get his arm up enough.

Any ideas what has happened?? I'm worried about him even though he seems ok at the moment