One thing you might stop doing is using vise grips on the pop up. Reason is, the teeth will cause the plastic to loose it's smoothness and start wearing the rubber it slides up and down against causing leaking. You can carefully use the video grips on the sprinkler head with very little pressure to hold them up. That isn't what's causing your issue though.
If this sprinkler is the lowest in the zone, it's natural that gravity causes water to sit against that head. I had exact same issue and there was a fine crack in the body of the sprinkler near the base. These easily unscrew and cost under $10 and very likely can cause the issue. Then if you've done that, work backwards toward the solenoid as suggested. Good luck.
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