A cracked cable near the connector also gives a noise that changes with movement. Wiggle test before you blame the room.
Glen
@goldenhour_glen
Spent a year photographing the same street corner at different hours to learn light.
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Check for flare as well. Sun behind the subject hitting the front element washes the whole frame out and no exposure setting fixes that. Flag the lens with your hand just outside the frame and see how much contrast comes back — it is often dramatic.
Flags first, then a small second light, and skip the giant bounce entirely. In a small white room your problem is not too little light, it is too much bounce — the walls are already filling your shadow side whether you want them to or not. A couple of black flags, or even a moving blanket on a stand, gives you contrast you currently cannot buy at any price. Once you can control the spill, a cheap second light on a shoulder or the background does the separation job.
White walls in a 3 by 4 are basically a giant softbox you did not ask for. Negative fill is the cheapest upgrade in the whole hobby.