Grundfos mq3-45 keeps cycling on and off


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My Grundfos mq3-45 keeps cycling on and off every 1 minute now. It used to stay off for 10 minutes when it was new. It's only 3 or 4 months old now. It pumps about 75' over level ground through 3/4\" pipe. Is it common for this pump to lose it's pressure so fast?
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