Hello, I've been having this exact same issue as well for quite some time with my GL-X750V2 regardless of what channel I use. Only the 2.4gh wifi is affected and becomes unusable while the 5ghz and LAN connections keep working just fine. I can replicate this whenever I try to send large files to my Synology NAS (connected to the LAN port) from a 2.4ghz wifi client. How can we resolve this? This shouldn't be happening, especially since I'm running the latest firmware for the GL-X750V2. This bug should've been fixed a long time ago.