Your SatoshiPay wallet may be removed if you clear your cookies or other browser data, as the SatoshiPay wallet is kept in the browser's "local storage". Therefore it is important to back up your SatoshiPay wallet! By backing up your wallet, you can always recover your wallet on a device - even if you cleared your cookies.
Read more about backing up your wallet here.
In case you have not backed up your wallet and you have lost it, please send the payment details of your recent top-up to firstname.lastname@example.org, as well as your new wallet's account ID/public key. Our colleagues in the Customer Support Team will investigate the issue and provide you with the best solution within one working day.