wrt 1900ac težave z wifi

Imam router wrt1900ac z nameščenim Firmware: DD-WRT v3.0-r28788 std (01/13/16).Zadnje dni se mi dogaja, da se ne morem povezati z prenosnikom ali telefonom na wifi kljub dobremu signalu.Največkrat je omejena povezava ali pa napiše ,da se ne more povezati na to povezavo. Reboot routerja ali izklop elektrike reši zadevo. Poskusil sem že z brisenjem mrežne kartice na prenosniku in wifi povezave vendar to največkrat ni rešilo problema. Morda kdo ve kje izkati napako?

Imam izključen dhcp (siol modem)in disable Wan.Imam omogočen wifi 5Ghz in 2.4Ghz:
Physical Interface ath0 - SSID [xxxx_5ghz] HWAddr [14:91:82:BB:AC:1A]
Wireless Mode
AP
Wireless Network Mode
Mixed
Channel Width
Dynamic (20/40 MHz)
Wireless Channel
Auto
Extension Channel
auto
Wireless Network Name (SSID)
XXXXX_5ghz
Wireless SSID BroadcastEnable Disable
Advanced Settings

Wireless Physical Interface ath1 [2.4 GHz TurboQAM]
Physical Interface ath1 - SSID [XXXX] HWAddr [14:91:82:BB:AC:1B]
Wireless Mode
AP
Wireless Network Mode
Mixed
Channel Width
Dynamic (20/40 MHz)
Wireless Channel
Auto
Extension Channel
auto
Wireless Network Name (SSID)
XXXXX
Wireless SSID BroadcastEnable Disable
Advanced Settings

Physical Interface ath0 SSID [XXXXX_5ghz] HWAddr [14:91:82:BB:AC:1A]
Security Mode
WPA Personal
WPA Algorithms
AES
WPA Shared Key
*********
Unmask
Key Renewal Interval (in seconds)
3600

Wireless Security ath1
Physical Interface ath1 SSID [XXXXX] HWAddr [14:91:82:BB:AC:1B]
Security Mode
WPA Personal
WPA Algorithms
AES
WPA Shared Key
*******
Unmask
Key Renewal Interval (in seconds)
3600
(Default: 3600, Range: 1 - 99999)
Custom Config

Router je v Bridge načinu

Bridging
Create Bridge
Name STP IGMP Snooping Prio MTU Root MAC
br0

Off

Off
32768
1500
14:91:82:BB:AC:19

Assign to Bridge

Current Bridging Table
Bridge Name STP enabled Interface
br0 no eth0 eth1 ath0 ath1


Bonding
Bonding
Bonding Type
balance-rr
Bonding Interfaces
1

Hard reset smo maredili pred 5 meseci in smo router nastavili povsem drugače, kot je bil. Poskusil sem nadgradit verzijo DD-WRT v3.0-r28788 std (01/13/16)z novejšo
v3.0 [Beta] Build: 40559 webflash.bin 2019-08-06 prek Firmware Management, vendar mi po rebooto še vedno ostane verzija DD-WRT v3.0-r28788. Ne vem zakaj?

Trenutno sem lahko naredil nadgradnjo na DD-WRT v3.0-r36247 std (06/29/18) Poskusl sem tudi na novejšo verzijo vendar upgrade ni uspel. Bom poskusl zvečer ,ko bom mel več časa.