Maybe your Net dropped for a sec, and LFS got confused? Shouldn't pop up without network debugging on though
If it hasn't happened before, hasn't happened since, then it's not really a "big problem". I had a "big problem" earlier, when my new 1337 PC wouldn't read my old hard drive, which has 6 years of everything. That's a big problem. This isn't
Does anything else happen in-game when it happens? As in, do you or others lag? If not, I'd say just put up with it, it's a nuisance I know...Make sure Network Debug is off (press Shift+F8 and it'll tell you) too, just on the off chance...But if it was, you'd be getting a load of random debug info too