I avoid extenders and bridges. Be sure the firmware for all units are up to date. I would power down all the routers and start by powering up the first one and see if the issue exists, then power the next one until the issue returns and go from there. It does sound like you could use a mesh system.

Do you connect the internet source/modem -- 941HP( router mode) )))((( 941HP(RE mode)/840N/845N/840N(RE mode)?  If not, just correct me.

 

With wired device connected to the system, what is the IP address and default gateway it obtains? 

https://www.tp-link.com/en/faq-838.html 

 

What about the wireless devices at that time? Did they get the valid IP address and default gateway? 

 

Besides, at that time, are you able to login to the web UI of the 941HP (router mode)? If so, please post the status page which helps a lot. 

 

Good day. 

ArcherC8 / Anton L.Z.,

 

Thanks for the support!

 

First , i need to give an important tip, ( it seems crazy ), after aproximately 30 seconds after wifi fall down if i reset the router [(2) TL-WR941HP ( router extender -  SSID CASA_ARVORE_TURBO )] my network returns to the normality .

 

Note: 

   ----> the router [[[  (1) TL-WR941HP ( router mode -  SSID CASA_ARVORE_TURBO  - DHCP SERVER )  ]]] stays 500 meters away from my house , in my parents house.

 

 

as soon as possible, probably next weekend,  I wil verify both solutions and put the information here 

 

Good evening

 

 

(1) TL-WR941HP ( router mode -  SSID CASA_ARVORE_TURBO  - DHCP SERVER )  -->   stay in my parents house

Firmware Version:	3.16.9 Build 20170106 Rel.54779n
Hardware Version:	TL-WR941HP v1 00000000

(2) TL-WR941HP ( router extender -  SSID CASA_ARVORE_TURBO )   -->   stay in my house

Firmware Version:	3.16.9 Build 20170106 Rel.54779n
Hardware Version:	TL-WR941HP v1 00000000

(3) TL-WR940N   ( bridged of TL-WR941HP - SSID CA_940N )  -->   stay in my house

Firmware Version:	3.16.9 Build 160620 Rel.49453n
Hardware Version:	WR940N v4 00000000

(4) TL-WR845N  ( bridged of TL-WR941HP - SSID CA_845N )  -->   stay in my house

Firmware Version:	3.16.9 Build 151229 Rel.72828n
Hardware Version:	WR845N v1 00000000

(5) TL-WR840N  ( bridged of TL-WR941HP - SSID CA_840N )  -->   stay in my  house

Firmware Version:	3.16.9 Build 150909 Rel.75475n
Hardware Version:	WR840N v2 00000000

 

 

 

 

ArcherC8,

 

 

After a lot of tests, power down and power up, i verified that i can´t connect equipments by cable in these routers : 

 

   (3) TL-WR940N   ( bridged of TL-WR941HP - SSID CA_940N )

   (4) TL-WR845N  ( bridged of TL-WR941HP - SSID CA_845N )

   (5) TL-WR840N  ( bridged of TL-WR941HP - SSID CA_840N )

 

in these equipments work as well :

 

  (1) TL-WR941HP ( router mode -  SSID CASA_ARVORE_TURBO  - DHCP SERVER )

  (2) TL-WR941HP ( router extender -  SSID CASA_ARVORE_TURBO )