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I once had to debug a poorly-designed board where the CPU would lock up if you did a DRAM burst write with at least 3 of the 5 highest bits of the word set (yes, I narrowed the test case down that far). A quick look at the layout confirmed that those traces were routed directly under the crystal oscillator without any form of ground shielding...

(We ended up underclocking the CPU by about 20% because there wasn't enough time for a redesign. Sigh. It's a miracle the thing even worked in the first place...)

... then your power supply goes marginal (because it will) and well . . . never been there :-)

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