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I'm having an issue with intervals ramping up at sunset. I have set an interval of 25sec, for 600 shots. Right at sunset the intervals increase (up to 5sec. Intervals) and then stabilize back to 25sec after about 60 frames (or 10 minutes).. Any Ideas?
Nikon D810, TPLink 3040v2, and Nexus 7 tablet. Intervals triggered by Kessler Second Shooter +.

I'm not sure I understand the problem.
You are triggering the camera with 'Kessler Second Shooter +' and the interval is set to 25sec.
You are saying that the intervals increase, so isn't then the problem with the interval timer?

Can you eventually explain the whole procedure, what exposure settings did you use, what settings did you use for LRTimelapse?