I would look for a kink or pinch in the water line or an obstruction in the water line, maybe at the water filter. If your unit has an accumulator tank to stabilize water pressure from a water pump, it might be a restriction is reducing water flow and it's the accumulator that is overcoming the problem for the 30 seconds.
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2015 Wildcat 282 RKX
2011 F350 Lariat, 6.7 L. Diesel, 8 ft., SRW, Reese R20
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