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> Do i need, in a regular basis, check if there are any updates on the device (nano x) in order to keep access to my funds?
No, as long as you have a safe and secure backup of your recovery / seed phrase, safe from unauthorised access and safe from accidental destruction or loss (two copies at different physical locations are advised, to protect from fire / disaster).
> Is there any risk about loosing access if not keep the device up to date?
No, same as previous answer.
Your ledger is only needed to get the deposit address and sign transactions e.g. to transfer cryptos from your accounts.
Your cryptos are stored on the blockchains, not in your ledger. The only thing stored in your ledger is your seed phrase, i.e. the key to your accounts on the blockchains.
You can always update the firmware later, if needed.