Hey Dion,
first time someone shares such experience.
I am pretty sure the issue is not with the EAs. It doesn’t matter for them on how many platforms you use them and which are the brokers.
Tell me more about the brokers you use and the laptop.
Meta Trade uses RAM so you better have 8 GB or even 16 GB would be better.
Which are the brokers that you use?
I am afraid they might have seen your profits and stopped executing the trades for some reason to make you lose.