This problem is not unique to the SNA or even just Luxpower.
I have installed quite a few ranging from the SNA to the 12Kw.
This is happening all over and it seems like a few Deye installs are also experiencing something similar. (much less frequently)
I was also under the impression it has something to do with the grid connection, but it can happen anytime, even under loadshedding.
I hope they get a fix for it soon or I might just be changing install brands.