Hi, I have an issue with automated trading in tradestation. If I restart tradestation(or it discconnects and then strategy recalculates) when strategy orders already exists, it will create a new one without cancelling already existing order, so I will end up with duplicated orders. Is there any way to fix this?

you should either cancel the order before restarting (assuming you restart on purpose), or you should always make it habit to cancel old orders upon a restart. I know of no way to auto cancel orders. I suppose you could do it with some special programming.