Just to let OP knows that I may be experiencing a similar problem. I still need further observation before concluding anything.
Things worked fine before 1.6 (not 1.6.1). After 1.6, groups of Dino gets low health (30 to below 75) due to starving/thirstiness. It happens occasionally (around 15 mins). Upon brief observation, I find that they got panicked a lot (running around with “panicking” status). That happens on my all-herbivore enclosures as well.
Currently (more observation is needed as said), the unusual thing I found is they remain in the panic states unusually long after the jeep has left the enclosure, for restocking run. 10 seconds I would say (Judging by the distance of the jeep from the enclosure. I didn’t sit there all day long observing their life. I was playing challenge mode on Jurassic difficulty so I didn’t have the leverage).
One of my suspected theory is there might be something wrong in the coding (maybe related to herding) that makes the panic state ripples and spreads long after the threat is gone. I don’t know, TBH.
At the meantime, I will observe more carefully on my end and I hope you can let us know too, the details of your case. Perhaps, we need to go for bug report, as Steggs suggested.