If the Equity on the account exceeds 10,000 USD or its equivalent in account currency.
Equity is the current amount of funds, which is calculated according to the following formula:
<Equity> = <Account balance> + <Floating (not fixed) result for open position>
You can view the current Equity in "Trading" tab of your trading terminal.
In case the Equity on the trading account exceeds the numbers specified above and the increased leverage is automatically decreased to 1:1000, you have to decrease the Equity up to the required numbers and send the second request to restore the leverage in "Change leverage" section of your Members Area.