@Kevin_Z 

Sir I followed the link but I did not see anything relating to a beta firmware. 
 

Can you please send this to me?

@Taserface Thanks for the beta link.  I have not tried it as I wanted to be using the latest: I'm using the latest official version which is later than the beta.  I can tell you that on my 1 gig internet (960 down/35 up), the problem is still not fixed.  With QOS turned on, I can get the speeds I set in QOS: 800 down/30 up.  After about 2 days, the download speed drops from 800 Mbps to about 400-450 Mbps.  The upload is unaffected.  With my setting to reboot every morning at 5am, I'm able to retain the 800 Mbps speed (albeit with a 60 second down time at 5am while it reboots).  If I turn QOS off by turning off application priority and making sure NO devices are selected in device priority, I can get the full 960 forever.  So it is the QOS that is doing this.  But I have to have QOS as without it, bufferbloat makes the internet unusable for everyone on the router whenever someone uploads a large file.

Regards,

Mike

@Mikey_C 

I would try the beta version as i have the beta and not had any problems yet. been running it for more than 4 months

@ycwkpp8989 I have the beta running now and removed the auto-reboot.  Will see if it works better.  If this beta keeps getting recommended as the solution, can we at least get one that doesn't have TP-LINK BETA plastered all over the UI?  It has been around for a year and a half now, is earlier than the latest official release (which is also a year old and doesn't work).  I wish I had known before I bought this that TP-LINK had no interest in actually supporting it.

Mike

OK, I ran the 1.1.4 beta for 24 hours and it's worse than the latest public release.  When I first installed the beta, I was getting my normal ~750 Mbps download speeds but my ping plots were more unstable and one out of every 5 or so times I ran a speed test, it would only get 80-90 Mbps.  I let it go without rebooting for 24 hours and today my speeds were down to 590-610 Mbps and would drop a little over time (during the download cycle).  I put the public release back in and when it rebooted, I was up to my normal 750-800 Mbps speeds again (I have my QOS set to 800 Mbps so that's full speed for me).  I'm just going to keep the public release running with a reboot cycle every morning at 5am as that seems the most stable for me.

Mike

@Taserface  yes, i had the same issue not long ago and i found out that the only thing you have to change is your download and upload speed for priotirizetion to manual and input you true download load and upload speed the you at getting from you internet service provider, do not use the speed test results for your settings. I used to have 200mbs download and 50 upload then a switch to 1gb download an 200 upload, but when performed a speedtest on my pc was getting only 200mbs download and 50 upload and that what it make me realize what was happening. 

hopefuly this works for you

@Taserface I've done that and unfortunately it doesn't help if you have gigabit internet speed.  My actual internet speed is 960 Mbps down/35 Mbps up so I have the router set to 800 down and 30 up.  With QOS on, it maintains the ~800 down for about a day or two and after that, it will run at ~450 down until you reboot it.  I assume TP-Link has no interest in fixing it since the current firmware is now 13 months old and no updates in sight.

Mike

@Mikey_C Mike, hope you don't see me as being rude, but I feel compelled to ask - do you really need the QOS? I'm asking because I have not yet heard of a router manufacturer that has got the implementation right. Specifically, I'm a member of SNB, which is devoted primarily to Asus (I used to use Asus routers but I finally wisened up), and the one and only recommendation they have for QOS is to turn it off as "it never works", causing a myriad of problems, among others cutting download speeds.