Wemos D1 mini with WLED stops working after a few minutes - how to diagnose?

Hi.

I have wled uploaded on wemos D1 mini, it works fine but only for a few minutes. After a few minutes of operation the whole thing crashes, no communication.
Neither resetting the wemos nor disconnecting the power supply helps. After disconnecting the power supply and reconnecting it, it is still impossible to connect to the wled. After a few hours off again a while it works properly.
I add that hardware is all right because previously for several years I used it with another application and there were no problems.

Has anyone encountered such an operation? How do I diagnose what is happening?

To me it looks like damage on the board (cold solder , maybe a capacitor) .
Repload anything and observe the behavior , if it does not change then you have the culprit .
Programming can not damage the board in the way you describe , I at least have not heard although my knowledge is limited .

The problem turned out to be the internet access point.
If the wled was connected to a wifi repeater then the above situation just occurred. When connected to the main router it works normally.