Hi, just wanted to chime in with something similar - I've been playing solo on switch for about a month with zero issues, it's been excellent. After the very recent update I'm getting somewhat frequent crashes, always during battle - it freezes then closes to dashboard with "the software has stopped working". I've been able to push through with frequent saves. The crash doesn't seem to have an obvious trigger, sometimes it's during a massive visual effect heavy battle but it also occurs during smaller scraps without many enemies. Occasionally audio bugs will accompany this but not every time. Reloading and replaying the section always works but I may get another crash at a later point in the same battle.
Overall I'm having the best time playing this monster, it's so much fun I can't believe I didn't play it sooner. So I figure the least I can do is report the issue to help out. I've been recommending friends give it a try and I'll continue to do so, but I'll also be looking for the next patch! Thanks for reading!