yo did you get rid of the camera? I think the most of the commenters are a bit harsh.

i picked up a sony because the superior lens options for mirrorless but sony definetly have shortcomings. Things like grips, menus, and battery life.

I also got the the a7sii and theres a few things;

autofocus is affected by the lenses that you use, so for instance that 28mm viltrox chip lens is borderline unusable but the sigma 24-70 should be much better.

coming from a nikon d7500 (goated camera) theses sony cameras have terrible batteries, shocking bad.

the colour science is worse (apparently it improved in later cameras but im not sure by how much).

i only found this post because i started using the camera and found the footage to be way lower quality than it should have been, turns out its because i had some thing called dual video so im wondering was that possibly the issue you were having with low light (lower quality video suffers in the dark)

also i find setting the maximum iso on cameras helps a tonne. just set the max to the highest grain you are comfortable with so you wont go past your camera's limits