I'm building a portable shade structure for use on...

I'm building a portable shade structure for use on desert playas in the US southwest.
I tested it today in Las Vegas with temperatures around 108F.
Even though I fully tightened the screws in the Maker Pipe connectors, eventually there was slippage occurring between the connector and the pipe.
Have other people encountered this? Is this to be expected with higher temperatures? Is the heat shrink in the connector becoming pliable due to the heat?
Note that I don't have heat shrink on the pipe. Would it help to do so?

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