TP Link never again.. I have an Archer 5400 and I have the same problem, it's chronic, the brand knows but doesn't do anything to fix it.. I don't recommend TPLINK ever again.

@Obelisk3847 I can't send it here, as there is a 10mb limit, if you want, call me in PM and I'll give you the link

@Obelisk3847 I had the same problem, I went through everything to find a solution, even the last one released > 1.2.9 Build 20230907 rel.96516 is not working well to solve use this beta version >...

@CihanCo This work for me , a im use 1.2.6 Build 20220511 rel.37896 Archer C5400 https://community.tp-link.com/en/home/forum/topic/111869?replyId=458200

@CihanCo TP LINK is really wanting with support on the archer C54OO , I have the same error of 500 MB I FALL 200 MB only if I restart the device. unfortunate.  

Thanks my friend, work for me. Thx