Radar is correct. TPLink has given up trying to fix the D9 and settled on firmware 150826 as the best of the worst. 160303 was very buggy and locked the unit to their intended EU certification. Try...

160303 locks the D9 to TP Link's intended EU certification. (WiFi channels, power restrictions, etc.) It is known to have most of the previous bugs and has been recently withdrawn from distribution....

160115 was buggy as well. TP Link pulled it very quickly. There quite a few TP Link modems and routers using the same basic firmware, with the same basic bugs. Hard to understand why TP Link can't...

I am not aware of any updated firmware. Waiting patiently. Javedformiandad might want to know that error reporting in 150514 does not work. This is why he no longer sees any downstream packet errors....

1. CRC error reporting did not work in firmware prior to 150826. CRC errors now shown in 150826 undoubtedly existed in older firmware, but were not displayed. 2. 150826 has issues with wifi bandwidth...

The Error reporting doesn't work in 150514. It does work in 150826. 160303 is still buggy. I'd wait for better firmware.