I recently purchased a C5400 to replace my R8000 from Netgear. Love love love the router but I'm having 3 issues that are pretty annoying and I'm wondering if anyone else is having them. I have seen something similar but the threads are old so I decided to start a new one. 

Going from strongest issue to weakest:

1. 2.4 Ghz drops everything on it randomly. This has only happened once since owning this router. However, I've only owned the router for about 2 weeks so it's kind of making me worry. I've noticed that other users have this issue but there seems to be no fix so far and the firmware is over a year old.

2. 5Ghz - 2 is problematic. The 2nd 5Ghz radio on my c5400 maxes at 2Mbps on a 400Mbps connection. I'm open to the possibility that there's something interfering with the signal but I haven't yet moved or tried the router elsewhere. If the device is less than 5ft away I get better but still not max speed. 5Ghz - 1 is unaffected.

3. I can't seem to get the speed test to work. With my last router, the QoS depended on the speed test, so I am not sure if it's the same here or not. I haven't tried enabling QoS but would like to, which is why this is an issue.

Any help would be appreciated. I'll likely contact TPLink for support, was just hoping folks who've experienced this might speak up and let me know of a remedy.

Thanks.