EDIT: All this started when Electrum Mac asked me to split my wallet into 2 wallet files, now I can't connect any of them
Your USB cable or your USB port on your computer is going bad. Try it on another computer. You can have the same Trezor wallet with on mutiple computers.
No, Trezor works perfectly, USB cable/port as well. I can open other Electrum wallets, just not this specific one that was split into 2 when updating Electrum
What do you mean the wallet was split into 2? Electrum shouldn't split your wallets as far as I know. Is that wallet a multisig address perhaps?