Sprinkled screen

More and more I get a sprinkled screen - only few seconds and only on a part of the screen - and the location changes

Any idea? Problem with the display, contact issue?

Screenshot from bottom of the screen: here

I assume you’ll find a lot of ideas here:

After a longer observation period: It must have something to do with the SD-card slot. When there is no SD card inserted or if the SD card is disabled (via storage menu) these patterns do not occur.

I tried with different (size, manufacturer) SD-cards, I clean the golden contacts - this didn’t help.

To clean the SD-card slot seems not to be possible, the contacts are hidden under the cover.

What next?

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No - it is not the right guess - screen problem starts again without SC-card.
BTW - screen module was already replaced.

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