I have an AT&T BGW530-900 modem configured with a passthrough host to by Deco BE25 acting as the router.  About a week ago, I noticed some slow internet speeds from my laptop.  While I have 300 Mbps service, I normally only get around 200 to 250Mbps down, but my laptop was limited to around 30Mbps.  I tested other clients on my network including my phone, my hardwired iMac, etc.  Everything that I can run a speedtest on is limited to around 30Mbps.  I even connected my laptop directly to the BE25 with a network cable and had the same speed.

But if I do a speed test at my AT&T modem, I get 200Mbps.  If I do a speed test on the BE25, I get 200Mbps.  If I connect my laptop up to my AT&T modem, I get 200Mbps.  This has got me stumped.  I don't remember configuring anything different the past week.  I don't have QoS enabled.  Any ideas?