@NiallPorter I have started to experience same issue. I have had demo M5 now about 2 years but only having this problem since the latest deco update

NiallPorter wrote

I have three Deco M5s, which are set up as a router and the main one is connected directly to my VDSL modem.  This has been stable since I got it a couple of months ago but the past few days the Deco system seems to "crash" several times each day.  The two additional units will show flashing red LED, the main one (connected to the modem) shows a solid red or orange LED.  After a few minutes this will usually resolve itself.  The network status LEDs on the modem still look OK when the Decos are not working.

 

Like a lot of people just now my wife and I both work from home so we need this to be stable all the time, any help gratefully received.

@Sami_74 I am having same issues here. 

It appears no one have the answer to this problem.

@NiallPorter - sending this to whomever will respond as I am having this same issue.  NEVER had an issue with this crashing and rebooting until March.  Matter of fact I purchased a new cable modem becuase I thought that was the issue.  Several times per day the WiFi system needs to be rebooted causing constant work stopages as do I work form home.  This is so frustrating that I am ready to go spend much more money on a Mesh system that doesn't constantly crash.  My ISP says it isn't them, and for once I actually believe them! Spectrum says it is "WiFi Interference and I should change the channel"  funny thing is it wasn't until that conversation that I realized that you can't even do that they don't have the functionality!