You've got a bad sending unit, bad oil pump, or worn-out bearings. Take it to a garage and have the oil pressure checked. They can tell you what the problem is.
We'll assume you checked the oil level and that's OK. When idling at low speed the oil pump is also turning at lower speed. You're getting intermittent low oil pressure readings.
Did they change the filter at that oil change? (They might have screwed that up if they did and there's restricted flow.) If you didn't, the old filter might be clogged. At any rate, I'd look to the filter first.
Then have the oil pressure checked. The pump might be failing.
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