Oh man, I feel your pain and we went through the exact same thing with our monitor when our kid was a newborn and and it was the worst, kept me up all night worrying. Turns out, for us, it was mostly about electronic interference from stuff in the house. We have a microwave in the kitchen that's kinda close to the nursery, and every time someone used it or even if the fridge kicked on, the signal would glitch out. So we started by unplugging unnecessary gadgets at night, like extra chargers or that old baby swing we weren't using, and that helped a ton. Also, elevating the camera unit higher up, like on a shelf instead of the dresser, made a difference because the signal could travel better without furniture blocking it.
Another thing, check if your monitor has a sensitivity setting or something, ours did and turning it up kept the connection more stable. And yeah. Don't forget to update the firmware if it's one of those models that allows it, sometimes that's the magic fix. Hang in there, you'll get it sorted.
