ZHA line connection red and yellow mean?

I’m having a problem with some of my Zigbee getting no signal (it’s in the next room) wondering how to fix it. Based on visualization I can see red and yellow lines (is this bad?)

Do I need an extender?

In Indonesia, our house builds using bricks which might cause a lack of signal, even though my coordinator is actually in the next room.

A temporary solution is to restart my HA, but wondering if there are better solutions.