Interface needs to be manually restart

I use my router as a WiFi to ethernet bridge (AP hotspot -> OpenWRT Router -> Ethernet swtich) and I notice that frequently the connection stops.
I have to manually restart the wwan interface on the interfaces tab, and it appears as if the AP to which I'm connected to is connected properly with a good signal strength.

How can I automate the process? (crontab?)
or even more easily, is there an option that restarts the interface when such case happens?

TP-Link TL-MR3420 v5
OpenWrt 19.07.2 r10947-65030d81f3 / LuCI openwrt-19.07 branch git-20.057.55219-13dd17f

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