In most of cases, the reason is that symbols are stopped in the price feed application your system is connected to. To make sure, access your server and check the column time on your price feed for those symbols. Restart your price feed application and if you noticed that the symbols stopped from there then you need to contact your feed provider to solve the issue for you.

Related Topics:

• Most of the future symbols were stopped from yesterday; can you tell me why did that happen?