In case the beta firmware couldn't solve the problem, please submit a ticket to TP-Link so that someone will follow on your case.
Ticket system: ticket.tp-link.com
TL-WR841N V11
EU: http://static.tp-link.com/wr841ndv11_eu_beta.zip
Archer C7 V2
US: http://static.tp-link.com/Archer%20C7(US)_V2_170117_beta.zip
CA: http://static.tp-link.com/ArcherC7v2_fr_ca_3_15_1_up_boot(170118).zip
EU: http://static.tp-link.com/ArcherC7v2_en_eu_up.zip
Archer C7 V3
US: http://static.tp-link.com/ArcherC7v3_en_up.zip
TL-WR841N V11
EU: http://static.tp-link.com/wr841ndv11_eu_beta.zip
Archer C7 V2
US: http://static.tp-link.com/Archer%20C7(US)_V2_170117_beta.zip
CA: http://static.tp-link.com/ArcherC7v2_fr_ca_3_15_1_up_boot(170118).zip
EU: http://static.tp-link.com/ArcherC7v2_en_eu_up.zip
Archer C7 V3
US: http://static.tp-link.com/ArcherC7v3_en_up.zip
Archer D7 V1
EU: http://static.tp-link.com/Archer_D7v1_1.6.0_0.9.1_up_boot(170303)_2017-03-03_11.02.39.rar
MR6400 V1
EU: http://static.tp-link.com/MR6400V1(EU)_170411.zip
Archer C7 router crash Solution :::
THE BEST IMPROVEMENT TO THE ROUTER
*** change the firmware to DD-WRT
https://www.dd-wrt.com/site/support/other-downloads
Path: Downloads › betas › 2018 › 04-06-2018-r35681
EU: http://static.tp-link.com/Archer_D7v1_1.6.0_0.9.1_up_boot(170303)_2017-03-03_11.02.39.rar
MR6400 V1
EU: http://static.tp-link.com/MR6400V1(EU)_170411.zip
http://forum.tp-link.com/showthread.php?94180-Archer-C7-router-crashed-by-Dell-laptop-with-Killer-adapter&p=195886#post195886
Archer C7 router crash Solution :::
THE BEST IMPROVEMENT TO THE ROUTER
*** change the firmware to DD-WRT
https://www.dd-wrt.com/site/support/other-downloads
Path: Downloads › betas › 2018 › 04-06-2018-r35681
