@Tedd404 Hi there, thanks for the answers.  Just to clarify some things.

1 - I didn't change anything, region or anything. I bought my EAP670 over Amazon Canada (amazon.ca) and this is the unit I received. It's the only one marked as 'US', all my other 3 devices are Canada (2 x EAP225-Outdoor and 1 x EAP225). It came with version 1.0.6 installed and never had an update and never flashed. I kept it as I received, not updates ever showed up for that unit.

2 - That is what I did so far with all my AP and my R605 VPN router.

3 - No, all my other 3 devices have very low retry rates ranging from 1% to 10% max. EAP670 will also do that except, like I said, here and there, there are very high retry rate for a certain amount of time, then it goes back to normal. EAP670 would represent the most 'used' AP in the house, I would say. I wouldn't say that I have bad connection on my main devices, everything seems to be working great, but those high retry rates 'annoys' me, something must be working bad somewhere, and I would like to pinpoint it. If it's a particular device that's doing this, there must be a way to identify it, no ?

  @Virgo I separate 2.4 Ghz and 5 ghz networks, but the retried rate widget I see, the one in the dashboard, does not state it gets this data from, I can't say if it's coming from 2.4 or 5 Ghz, and I can't say which device(s) is causing this. All I know, I can see, is that it comes from the EAP670.

I tried to optimize, but results were worse. Leaving all this at auto is the best results I can get, minus those occasional high retry rates. I have a surge at the moment, looking at it, I'm at 80% retry rate.

Dropped packets is surprisingly at ... 0% and has been that way for the last 24 hours on that AP.

And, the actual usage of devices is fine. I'm getting good results from speedtest connected to that AP while it says my retry rate is at 80%.

If it weren't for that graphic, I would say the network is fine, but it puzzles me that I get this, something must be wrong but..., I don't know where to see/get details about these results, so I can't say what's happening, I can't explain it.

  @Tedd404 Yes, I acknowledge it hard, I was in fact looking for a way to find more information about the issue than to resolve the issue itself, I know I'm lacking details, but since I'm rather new into Omada and that I checked almost everywhere and found nothing, I was looking to actually find a way to gather or consult more information about what was causing this or what was causing the EAP670 to report those high retry rate.

Yesterday I received 3 x EAP225, I think I will do the opposite, put the EAP670 offline and replace it with a EAP225, at the same physical place, just to see if the new EAP225 will report those high retry rates. If that's the case, I will know it's either the EAP670 that is faulty or that the current firmware and/or the EAP6XX line has issues as seen on another post.

On the other hand, if the new EAP225 reports the same thing..., I will have to dig on my network for something causing the issue.

I prefer doing this that way because..., I have about 45 wireless clients on at all time, and that I and my wife works from home (internet is crucial, meetings, etc.) and that after working hours and weekends..., my 2 boys are always gaming..., internet is crucial..., can't put this down for too long, hahaha :)

Ok, if anyone interested. I disconnected my EAP670 for the last 36 hours and instead connected my newly received EAP225, on the same wire and... I haven't got any retry rate higher than 4% on the last 36 hours !

It's either that I have a bad unit OR that the included reporting on that unit is badly interpreted.

I'm just mad that I received a new EAP225 V5, my previous ones are V1 and V3, but V5 is only reporting how 'busy' channels 2.4 and 5 GHz while V1 and V2 reports Tx, Rx and interference levels.

How on earth is V5, usually the latest one released, giving less information, being badly designed compared to V1 and V3. I would prefer have either a V1 or a V3... :/

  @pplante19 

I'm having the same problem and haven't found a solution yet. Something very strange happens to the EAP670, if you look at the questions asked in the forum, you can see that everyone basically goes through the same problems of instability in the network.

  @Randson I feel your pain, it's very sad after paying a premium price to get such a letdown. I now have EAP225 (V1, V3 and V5), and no more 670 and everything runs fine, I don't have high retry rate anymore. I have made a reset to the 670 and sold him. Not ideal solution, but to me, case is closed in a way, would not buy 670 again, considering no fix have been done by TP-Link since...