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I also think that this is not necessarily unique to the OP's vehicle, but the circumstance was unique: Most of time, when wheels hit the rumble strip, the driver gets out of that, steers away from that jarring, irritating state. The OP stated that it was for 10- 15 seconds, for whatever reason, which is a damn long time. And, rumble strips are of different frequency, and at different speeds, they will do different things: Point being, it is very likely that he just happened to hit the "sweet spot" of frequency, the one that detuned things.
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