**The W4500 Model does not come up in the pick list for whatever reason, but it's not a W3600

I have 5 W4500 units installed in the house, with one acting as the router.  ONE of the units loses connection with the mesh several times per day.  When it's connected, it's at full connection strength to both the router and two other nodes.  It will eventually recover from going offline (red light, all connections drop), but it's really annoying as it knocks cameras offline, interupts streaming, etc.  I've rebooted and reset the unit to no avail.  It says it is on the latest firmware.  Anyone else experiencing this or have any tips?  It feels like a lemon of a unit, as all the others are working flawlessly.  ISP (Starlink) shows no outages at the times this one craps out.