2300 bad day noise.

I was out detecting yesterday I could not use any settings above sensitivity 3 the noise was really bad. I could noise cancel and it would quiet down but within 5 minutes it was noisy again. The ground I was detecting is the same set of diggings I have detected all this week without any problems. At the end of the day back at the caravan park I talked to two other sdc owners who were detecting in different areas and they had the same hassles. It was Sunday are there more electrical devices or planes flying overhead or is it due to atmospherics or moisture as there was a heavy dew in the morning.?