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The advertising interval changing to 2000ms?

Hi! Im trying to figure out the power consumption of two types of beacons that uses nRF51 and nRF52. I have connected a small resistor in between the supply and measuring the voltage drop. In the beginning I observed that the voltage drop respected the advertisement interval, and I've got the spikes of voltage drop exact at the intervals the beacon was programmed to. But after a while, the spikes of voltage drop got in an interval of exact 2 Seconds. My questions is, is there any soft explanation of this? Is the beacon sending regular advertising packets in a different interval, or is it doing something else now? Maybe the beacon is in some kind of power saving mode? And is there any way possible to get out of this? Appreciate all help provided!

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