to emphasize: if I run X20+X20 wired, and all the M4s wireless - all is good (except the fact its slower) once I connect even a single M4, no matter to which port, and the beginning it will work...

@David-TP current cunfiguration: ISP -->X20 -->switch (TL-SG1008D) --> X20 + M4 + M4 + one wireless M4 once I change the M4s to be wireless, they dont get disconnected

Bottom line I'm on latest fw as far as I understand Since th last m4 update, the m4s are spuriously losing wired connection Connecting them wirelessly solves the problem, but is less optimal, given...

the label says Ver: 4.0

@ImtiazAli , I use auto update, and anyway, it says there are no updates BTW, once I disconnect the ethernet cable and connect these 2 units wireless to the mesh - the M4s are not disconnecting...

have the following deco network: 1. X20 - main deco - connected to the internet 2. X20 - connected by wire to main 3. 2xM4R - connected by wire to main 4. M4R - connected wirelessly to main I have...