you need to be careful with the variables you use and how you code, because if there is a VPS crash, those variables will be lost.
so always use "PositionXXXX()" and analyse the opened trades rather than relying upon variables.
EAs must be coded to recover.
If the power fails, OS crashes, terminal or chart is accidentally closed, on the next tick, any static/global ticket
variables will have been lost. You will have an open order but don't know it, so the EA will never try to close it, trail SL, etc. How are you going
to recover? Use a OrderSelect / Position select
loop to recover, or persistent storage (GV+flush
or files) of ticket numbers required.
On a network disconnection you might get ERR_NO_RESULT
or ERR_TRADE_TIMEOUT. There is nothing to be done, but log the
error, return and wait for a reconnection and a new tick. Then reevaluate.