The answer
Solana accounts require a minimum amount of SOL to remain rent-exempt. An associated token account can have a refundable reserve that is returned when the account is closed properly.
What to do next
Identify the specific token account in your wallet or explorer. Close empty accounts only with a trusted wallet feature and ensure that no tokens remain.
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Ledger hardware wallet
A hardware signing device to compare for supported Solana assets; it does not fix Solana network, token or smart-contract faults.
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Frequently asked questions
Does Solana rent get charged monthly?
The usual rent-exempt reserve is held in the account; it is not a recurring monthly charge.