nighthawk mr5100 keeps dropping speeds

I’m sorry that I don’t know how to help with your loss of speed, but I’ve been running an MR5100 for a little over a year without much issue. The reason I want to reply is to see if you could help me with how you got the MR5100 to work with your mesh system? I just got a MK73 mesh system and have not been able to get it to connect. I gave up and called nighthawk tech support and they told me there is no “pass-thru” mode on the MR5100 to make it act as a modem only. But if I’m understanding your post, and others I have seen, there is a way to make the MR5100 work with a mesh router/satellite combo. I would like to use the MK73 router close coupled to the MR5100 over Ethernet and then place a satellite or two as necessary throughout the house to improve overall network coverage. Any help you could offer would be appreciated. I don’t want to return the MK73 to purchase a single wifi extender if I don’t have to. But that is what the help support tech recommended I do…