Wifi automatic power?


just trying to to figure out what the wifi automatic power setting is. Have the TL Archer C7 AC1750 here and can set this up on both frequency ranges. Using my mobile phone with farproc wify analyzer and i see that in automatic mode the wifi power jumps crazy up and down.

Are there any more background information about this setting?

Which version of Lede is installed?
What are your wifi settings?

Model TP-Link Archer C7 v2
Processor Qualcomm Atheros QCA9558 ver 1 rev 0
Architecture MIPS 74Kc V5.0
Firmware Version LEDE Reboot SNAPSHOT r4684-0b7f7606dd / LuCI Master (git-17.220.63907-bbcf73f)

onfig wifi-device 'radio0'
option type 'mac80211'
option hwmode '11a'
option path 'pci0000:01/0000:01:00.0'
option country 'DE'
option log_level '2'
option htmode 'VHT40'
option channel '48'

config wifi-iface 'default_radio0'
option device 'radio0'
option network 'lan'
option mode 'ap'
option wps_pushbutton '1'
option macfilter 'allow'

Now i see that the "option txpower" is deleted, when automatic is set in luci. Every fixed txpower include the option into the config file again.