I'm curious to learn how your network is set up? 40MB/s is unusually lousy for MoCA. Are you sure
you've wired everything the right way?
With most MoCA adapters, the manufacturer includes a PC-based app which allows you to configure your MoCA adapter settings.
That includes an option for configuring the channel (frequency range) on which you want the device to be operating. This helps to prevent clashes between MoCA gear and other types of gear, which might have issues sharing the (Cable) medium with MoCA.
MoCA 1.0 and 1.1 Freq. range: 860 to 1600MHz (1.6GHz)
Moca 2.0 Freq. range: 860 to 1675 MHz (extended slightly over 1.1)
and added channels in the 500 MHz -600 MHz range, to be used by satellite operators
So with MoCA 1.0 and 1.1, cable TV, Over the Air, most digital equipment, there should be no interference issues.
If you have satellite, you're going to want to use MoCA 2.0, if possible.
BTW, it's also a really good idea if you ask me, to put a POE (point of entry) filter, usually at the demarc
in your network. It prevents signals from neighbouring cable or satellite gear from coming in to your home and prevents your signals from going out to someone else's equipment.
SOURCES: Moca manufacturer presentations and FAQs