SF1200: <70mbps routing = normal?

Technical Support for Routers
1

On a wired connection, I get ~400mbps with the edgerouter lite, but with exactly the same setup, got less than 70mbps on the SF1200 after a reset.

I’m sure it was faster before. Why might this be? What to check first?

version = 3.216, but there is no newer version of openWRT available? GL.iNet download center

2

It turns out that the sf1200 went unsupported years ago!

My plan was to just use it as an access point.

What I don’t understand is why it works for a bit, then randomly stops working? Do I really have to throw this in the bin and buy a new access point?