If MT4/5 maybe this is relevant?

https://zorro-trader.com/manual/en/mt4plugin.htm#remarks

Some MTR4/5 servers need a long time for the initial access of the price history of previously unused assets.
This can cause a timeout. The strategy will then not start, and a Error 054 or Error 055 message is displayed.
In that case just restart the strategy by clicking [Trade] again.
Inbetween the server had enough time to upload the missing asset.
You might need to repeat that step a few times until all assets load properly.