Handling worst case senario may EA fail

I have plan to Handle scenarios may cause Expert malfunctioning.

This is Error codes may return in the run time. However, I want to handle these errors and some may not even Return errors.

I made this topic to be a start point for something big and every one who is willing can contribute.

I will Update This When we found an acceptable solution.

For Example:

1- First Error That I encountered is Market closed with error code #4756. I noticed Ontick function Event still triggered When Market is Closed and this is strange! 

when Ea attempt to close position it returns this error.

solution: skip ticks when you get 4756.

solution 2: Check market status on every tick or when you want to close position if it is closed so return.

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scenario 2-Internet Connection failed and you have open orders.

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Scenario 3: Wide Spread, on rollover and news hour and holidays some brokers( if not all) widening their spread.

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Senario 4:  ERR_TRADE_DISABLED, simply check in OnInit

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senario 5:  ERR_TRADE_SEND_FAILED

I will add more scenarios and you are welcome to contribute.'