p3x-robot:

Supply the following if possible:

• Device problem occurs on

https://git.openwrt.org/?p=openwrt/openwrt.git;a=commit;h=8605ac87f822254af258bf8f20d24cd4186ff84a

• Software versions of OpenWrt/LEDE release, packages, etc.

mvebu: Disable internal RTC on Linksys devices

• Steps to reproduce

It is in a commit, the says:
mvebu: Disable internal RTC on Linksys devices

The internal RTC does not work correctly on these Linksys boards based
on Marvell SoCs. It is off by 3 minutes in 10 minutes running, this
was reported by multiple users. On the Linksys Mamba device the device
tree comment says that no crystal is connected to the internal RTC, this
is probably also true for the other devices.

But this 3rd internal I actually use the guest wifi, it would be wrong to disable it, as it is usable.
Besides in kaloz says, that they are saying that the mwlwifi will work the 3rd wifi.
kaloz/mwlwifi#280 (comment)