@Ainz Hi, please confirm if your C1200 is a US version or an EU version, then try the beta firmware in this thread: https://community.tp-link.com/en/home/forum/topic/156295

@Sumit56 Thanks for reporting the issue to the community. Can I have more details then our engineers can try to investigate further? 1. How many devices are connected to the 2.4GHz network, what are...

@rmadoo Thanks for getting back quickly, can you please also confirm how did you test the SIP ALG is still enabled on the router when you disabled it? BTW, what kind of service requiring to disable...

@Enyceckk I see, glad to know it works, we may also keep an eye on such issue, will try to figure out if there is any issue with the firmware.

@SamuelT Actually, I don't think this is the power issue as all the wireless devices are connected to the internet fine, while it's hard to say if it will cause an issue to some special devices when...

@koreiko Do you mean the 2.4G network is not stable and keeps disconnecting? What are the devices connected to the 2.4G network? When it disconnects, can any device 'see' it? Have you tried to reset...