Nope, this never happens to me (on a side note, just because he said 1st/2nd fight does not imply 1st/2nd node, he could be sweeping and talking about 10th/11th node)

There is rumor of problem with certain ninjas thou, like hinata I think, that causes issue when loading. I've also never had that problem but... could be a thing?
Thou I have REAL internet and REAL computers, this game leaks memory horribly and is not optimized at all. If you are using something like chromebook, you might have all sorts of problems.

This game requires 16GB ram man, you gotta have that at least.