DRAM refresh is pretty wild 
pic.twitter.com/7S00bsiy41
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Neither of those theories sounds right. You wouldn't normally continuously refresh such an LCD (looks like HD44780) likely issue is in LCD..
... but it can't be failed DRAM refresh in the HD44780 because the LCD constantly scans and DRAM reads=refreshes (and it likely isn't DRAM)
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I'm going to say noisy supply (or bad osc) causing glitching and SRAM corruption in the LCD controller as it refreshes the screen.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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