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I work for NI now!

Any strong copy left licence. It's not so much about that. For most open source licences it is primarily about someone taking your software, claiming it as their own, then sticking a new licence on it. You can get into a situation where someone that copies it, claims they wrote it and then comes after you for copyright infringement when you wrote the stuff. I had something like this on the NI forum where someone removed all the copyrights and proffered the toolkit as theirs. NI wouldn't remove it until I pointed out that it violated the licence which stated that all copyright had to remain intact and showed them the original toolkit (which had the licence text). Secondary to that, it enables good faith actors to know exactly how to distribute the software and comply with your wishes.

Realized I never closed the loop on this. It turns out it was a combination of things: intermittent faults in the fiber<->ethernet adapter due to a bad power supply intermittent latency caused by some heavy/spurious network traffic through a switch that was slowing down the TCP traffic throughput After fixing issue number 1, we eventually tracked down number 2 and unfortunately were unable to address as it was related to a separate critical system. Eventually I made some network changes to the cRIO found on this random page from 2009 regarding increasing the TCP buffer size. We've had zero issues in the last 5 months of operation. It feels like a hollow victory though because the LabVIEW TCP calls never threw any errors and my poor attempt at trying to use the system exec VI to monitor the socket memory for increases didn't show anything out of the ordinary, nor did any of the Linux system log/event files. Oh well, at least I sleep better at night now.