IOT 33 Wifi Range

Hi, I used the nano IOT 33 for a garden lights project.
I tested the Wifi range before starting and it seemed to be fine but having spent a long time developing the hardward and writing the code I find that it drops out quite regularly.
The hardward is mounted in a plastic box on a wall that faces away from the house where the router is.
Is there anything that can be done with the IOT33 to improve range or would I need to go to another Arduino/Wifi board with an external antenna?

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