By default, OpenWrt flash configures 3 radio signals that are disabled. After renaming and enabling them I noticed on the Overview page that the memory gets full, which later led me to notice that after a few hours the WiFi signal drops. I then have to reboot the router every time after about 3-5 hours every time.
This is the current release information I am using for my setup.
Sounds like a memory leak somewhere and OOM killer kicking in. It would help if you could check top output right after a reboot and at the point when you see your RAM filling up - and compare memory usage. You can sort top output I think, but you might feel more comfortable with something like htop, which has a more intuitive interface.
With the current state of radio support, enabling the radio2 is not advisable. I don't enable radio2 on my WRT3200ACM and it's running for months between reflashes (I do use @eduperez'es updated wireless driver/firmware tho).
For whatever reason, my radio2 reports all the power and radio0 and radio1 do not transmit a signal. In fact I tried to disable radio2 and it reverted the changes.
After a fresh reset of my version of OpenWRT I left radio2 disabled as advised which ultimately fixed the issue of the wifi kicking off after about 5 hours. Installing other drivers may be an option, but it is important to note that you attempt at your own risk.
I took the following steps on OpenWRT version 18.06.0 and installed @eduperez drivers found here using the following instructions:
STEP 1: Connect to router via Terminal ssh into router and enter the following commands
STEP 2: Install wget and needed wget dependencies using this command opkg update && opkg install libustream-openssl ca-bundle ca-certificates wget
STEP 3: Download the mwlwifi10.3.8.0-20180810 commit 7537480 for OpenWrt18.06.0 using this command wget https://github.com/eduperez/mwlwifi_LEDE/releases/download/7537480/mwlwifi-firmware-88w8964_10.3.8.0-20180810-75374802-1_arm_cortex-a9_vfpv3.ipk && wget https://github.com/eduperez/mwlwifi_LEDE/releases/download/7537480/kmod-mwlwifi_4.14.54+10.3.8.0-20180810-75374802-1_arm_cortex-a9_vfpv3.ipk
STEP 4: Install the drivers with this command opkg install --force-downgrade kmod-mwlwifi_4.14.54+10.3.8.0-20180810-75374802-1_arm_cortex-a9_vfpv3.ipk && opkg install --force-downgrade mwlwifi-firmware-88w8964_10.3.8.0-20180810-75374802-1_arm_cortex-a9_vfpv3.ipk
STEP 5: Reboot for settings to take effect reboot now