I am having the exact same problem right now and it is making me very upset! I updated ledger nano x thru ledger live a couple days ago and now it says failed to fetch when trying to swap tokens on Cetus. I then tried on my Sui wallet to swap and when I clicked swap it wouldn’t do anything
I just figured it out. Since I updated the firmware I went to my sui wallet and removed the account from my sui wallet that was hooked to my ledger, then I re added that account (had my ledger connected to computer to do this) and when I re added the account it worked