IoT Cloud + network connections

I have an Arduino MKR Wifi 1010 communication with an Arduino Nano IoT via XBEE.
The MKR requests data from the Nano and the Nano replies.
The MKR sends the data to an SQL Server via a local IIS website call
The MKR also requests/receives data from third-party site
Everything has been working fine for some time now (months:years)
I would like the MKR to post some data onto Arduino Cloud don’t is available away from my local network.
After some time running, the sketch reports it has lost communication with the device on the port.
And restarts the sketch when it detects the port is active again.
What’s going on ?

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