Filter gui sometimes closes when research finishes

[Honktown]

I'm trying to whittle down a "bug" but I'm having trouble reproducing it and wondered if anyone else ran into it:

1) open up a filter inserter's signal gui (don't know about combinators)

2) let a research finish

3) very, very rarely the signal gui closes (I don't know exactly when, but I've had it happen repeatedly when research was completing back-to-back with mods)

It took me a long time to connect the two circumstances. It's happened when I've had only one research, and had the queue enabled. With a mod the research queue was disabled, but the mod auto-queued the next one.