Mini overheating drops connection?

We have a bunch of Mini’s at oil and gas sites. they are in NEMA enclosures sitting outside. When it starts getting heated inside the box we see the minis drop connectivity to the cellular network

is there an issue with the heat sink???

There is no known issue and we have tested them to 149 degrees. If it is hotter than that in the enclosure then performance could be affected. Can the enclosure be vented somehow for some airflow?

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