If you are subscribed to a signal, you must have your platform open and connected to the internet 24/7.
If you can't have your laptop connected all the time then you should consider using VPS.
Below is the proper way of subscribing to a signal, anything else is compromise:
How to Subscribe to MT4/MT5 Signal
You need to find the problem of each EA specifically.
Check your local terminal's and MQL5 VPS's Journals for errors.
Then probably that EA requires DLL calls, that are not allowed on MQL5 VPS.
Contact the author/seller for advice and support.
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