Hi,
I found this post and I'm encountering a virtually identical problem. My girlfriend has an Acer laptop, our router is a TP-LINK Archer C7 AC1750, and when she connects to our wifi it kills it on a timeframe somewhere between 'immediately' and 'in 30 minutes'.
Is your fix still working? And if so, can you go into more detail on what you did? I found the flood protection setting on my router, I'm going to try enabling that for now.
Thanks!