Hey L&LD,
I normally stay up with firmware updates, I'm not a Network 'GURU' but I am in IT so I do know the values of staying up to date with technology and somewhat of the networking home user type setup.
And the reason I haven't stated that it has affected anything else on the firmware is because I have JUST upgraded and saw that issue and began troubleshooting that packet loss by going to online packet loss testers, running CMD PING functions, resets, restores, etc. But, not enough time to know if anything else if affected as I was working with that trying to figure that piece out first. And with me being in IT (Performance Tester), probably my downfall in the networking world

, when one piece of code is affected, it can affect other areas OR other areas of code may have not been QA'd as well as it should. I guess now you know where I get that from. I mean no disrespect, obviously you know tons more than me on networking, and appreciative of your help, but maybe leave the demeaning comments out and just post helpful information which is what these posts are for

. Like what you did for that AX88 guy.
Please note I have done resets to all my equipment but NOT to level of what you have described here...
Fully Reset Router and Network. But I have unplugged the hardware from power and data. Your process is very time consuming but will try to get this asap and report back and honestly I'm a little taken back at this extreme type of reset this is for something that should be pretty automated since how we 'all this technology'

. But I also have other things going like a 4 wheeler i'm having to replace a cam in and family to contend with. You know 'LIFE' hahahaahah.
I do have another question/observation, if I haven't made you mad by now

. Per your information for the guy with that AX88, there is some obvious issues with packet loss 'somewhere' in his multiple versions the he indicated... So my roll back shows it fixed my issue but his issue persisted through several versions for the AX88. One indication of his issue was the ISP might be the culprit. But it appears he switched ISPs and that appears to have fixed his issue(s).
SO with all that being stated, I have 386.4 installed (still showing packet losses). I will perform the 18 step 'full reset' to my network. Not looking forward to this as it is very time consuming. BUT to appease the powers that be, I'll do this and post my results

. Please note, that I have ALL wifi connections mostly 5ghz, about 3 items are 2.4ghz, (21 devices or so) no hard lines other than the WAN connection from Rise Broadband ( I know, but Rise is the ONLY thing around me). None of this should matter because when I use 386.3_2 (or prior versions) it works without indicating packet loss. I've roll back and upgrade a couple times now. Each with same results.. 386.3_2 shows 0.00% packet loss... 386.4 always shows packet losses. Even
https://packetlosstest.com/ show 0.00 % packet loss with both versions... same for PINGs etc.... Anyway, as soon as I get this process complete, I'll reply back. Might take some time as there is a surgery coming up for family member very soon.
Thanks in advance