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RAK 4630 freezes on solar charging #2856

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@mihvoi

Reproduced with 3 pieces of RAK 4630, using v1.16.0.
It freezes only on solar charging (and high temperature), not inside.
I even add a Raspberry radiator with no result.
Other people reported that using external MPPT seems to prevent the freezes.

It seems that Meshtastic does not freezes in similar conditions, so I suspect there is something in the Meshcore software specific to RAK.
On T114 it does not freezes, in similar conditions.

Sometimes I can successfully ping the RAK board and login, and it freezes immediately that I check the Telemetry.
Unfortunately there are no logs on those crashes. Actually, the USB is not detected by computer unless I give a reset.
Sometimes the configuration is corrupted after such crash (like node name), some other times a reset is enough for restart.

There is a thread here where multiple people report similar problems.
https://www.reddit.com/r/meshcore/comments/1t98wtf/rak_4630_green_led_and_locking_up/

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