How can I improve the stability on my Draytek Mesh setup?

I have a 2927 LAC router, connected to a cable modem via the WAN1 port, with a SIM card backup on LTE. This is hard wired to 2x AP802’s, and there is a 3rd AP802 on mesh Hop 1 via wireless. Edit: I have 2x Netgear Gigabit Unmanaged switches on the network, in between the mesh nodes and the router. The wired AP802s are configured to use the cables for backhaul. The overall ‘mesh’ setup appears pretty stable - if I login to the router the mesh is constantly green, and I can’t see anything that looks like instability in the syslogs. Devices can connect reliably to wifi on 2.4GHz and 5GHz (separat

Question by James Davies on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.