2002 SL1 dead guages

This morning, after a -25 C. night, my SL1 started fine but had no instrument guage response - fuel, tach, speedo, etc all zero.
Headlights, dashlights, signals, radio, etc were all normal. Guages came back to life after a shut-down & restart; <coffee-stop> 20 minutes drive later. Any ideas ? Thanks. John T.
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