Slow WiFi RBK53 and cannot disable mesh

After a lot of investigation, I noticed that when connecting to the new router I was getting GB as Country Code for the Wifi, while my Router was alwasy set to US. Double cheking the router in fact was still set to US. When I installed the new satellite I did it via the Mobile App, and all was finished with no error, in fact I was able to connect to the same wifi, excecpt that this problem of unstable speed popped up. So when I noticed that that satellite was using GB, I decided to execute a manual sync with the router (like I did when I install initally my ORBI). Both flashed ring white for a while until sync was concluded and the satellite returned to blue (as it came blue on the firse set up via the mobile app). But at this point all my net including the new satellite was set to US (no more GB). Since I did that sync (and is more than one week) i'm not having anymore the problem (!). I don't think was the country code but for sure doing the manual sync I think did the fix. Corssing finger, all is good so far.