Most likely this is underexposure, not bad film or a lab problem. Indoor home lighting is usually very dim for film. At around EV 5, ISO 400 film at f/8 would need roughly a half-second exposure, which your camera probably was not giving. If the flash was weak, it may not have added enough light either.

With color negative film, severe underexposure can cause color shifts due to reciprocity failure: the different emulsion layers don’t respond evenly in very low light, so scans can look blue and washed out.

So this is primarily a shooting/exposure limitation: low light, small aperture, and likely insufficient flash power. A lab scan can emphasize the issue, but it usually starts with the negative being too thin.

To avoid it, use much more light, a stronger flash, brighter scenes, or shoot outdoors/daylight. Faster film may help somewhat, but it will also increase grain.