Ethereum in wallet disappears after updating firmware

Hi all… new to forum.

I have a Trezor Model One with both BTC and ETH in a standard wallet.

It seems like each time I update the firmware on the Trezor One, I lose visibility to my ETH. If I go into settings → Coins, Ethereum is no longer highlighted. If I again highlight it and return to my wallet, the correct ETH value reappears in the wallet.

Anyone have any thoughts in terms of why this might be happening, and how to resolve so it does not continue doing this?