ZBT-WE1626 (ZBT WR8305RT) OpenWrt System log issue

Hi,

My router is configured in a AP + Client (WLAN) mode for usage. But the Kernel and System log are filled with messages

[ 3719.368737] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
[ 3720.860195] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
[ 3722.244890] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
[ 3723.631250] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
[ 3724.996041] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:29:57 2019 kern.warn kernel: [ 3834.323113] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:29:58 2019 kern.warn kernel: [ 3834.744983] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:02 2019 kern.warn kernel: [ 3836.117657] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:06 2019 kern.warn kernel: [ 3837.479930] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:10 2019 kern.warn kernel: [ 3838.842290] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:14 2019 kern.warn kernel: [ 3840.204230] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:18 2019 kern.warn kernel: [ 3841.566550] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:22 2019 kern.warn kernel: [ 3842.932162] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:26 2019 kern.warn kernel: [ 3844.294739] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:30 2019 kern.warn kernel: [ 3845.664375] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2
Sun Nov 24 14:30:34 2019 kern.warn kernel: [ 3847.058480] ieee80211 phy0: rt2800_config_txpower_rt6352: Warning - ignoring EEPROM HT40 power delta: -2

Any idea how to fix this problem.

Regards.

|Model|Zbtlink ZBT-WR8305RT|
|Architecture|MediaTek MT7620N ver:2 eco:6|
|Firmware Version|OpenWrt 18.06.5 r7897-9d401013fc / LuCI openwrt-18.06 branch (git-19.309.48729-bc17ef6)|
|Kernel Version|4.14.151|