id say that it may likely be due to power draw, your adapter(the hdmi to vga cable) you are using. If it isn't powered by itself it may be the cause of your problems, as the pi wasn't designed to power active adapters over its hdmi port, and your problem is likely intermittent as it may only occur when the adapters or the pi's power draw spikes such as when the display has a rapidly changing image or when the pi's processor is being utilized to its full capacity. This also explains why the adapter works just fine with your laptop.
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