Hi @Humancaptcha
Powerline is not supported for this very reason. I suspect there’s something in your home that a) only gets turned on at night and b) produces a lot of noise on your mains electricity circuits, disrupting the signal between Powerline adaptors.
We’d much prefer you to not use Powerline at all, but I understand that you probably have it in the first place as it’s the best available option. Finding the source of the noise on the mains circuits might be your only recourse. Typically, LED dimmer switches can cause such noise.
A nice, long ethernet cable from router to switch would be preferable (assuming the switch lives at the powerline adaptor and not the router).
I hope this helps.
"Common sense is the collection of prejudices acquired by age eighteen." - Albert Einstein