1. Due to online trading platform being slow one may find that the execution of the order is delayed due to order backlog or technical problems.
2. Entering a wrong stock symbol while executing a trade and in turn a wrong trade getting executed.
3. One enters opposite order like one wants to buy and places an order for sell and thus reverse order takes place.
4. One is not able to maintain a diary for number of trades executed in the system during day trading.
5. At the right opportune moment the trading platform is not available due to system overload or poor INTERNET speed or online broking terminal crashing due to ISP failure.