Ive just submitted a ticket to Support (After months of hassle!) 
C120 Firmware update 1.2.3 is causing huge network instability,  my Decos disconnect,  my other Tapo devices disconnect. 

After noticing the issues after my most recent device C120 and the firmware update to 1.2.3.  I removed it , returned it to Amazon. and bought another with R1.2.1. 
Worked perfectly and I bought another. 

So I was up to 2 C120's on R1.2.1.   working fine for last month,   and like a fool I thought I'd try R1.2.3 again and now back to stupid issues, tapo devices dropping ,  Deco devices dropping , pictures below disconnected devices and app telling me about network instability. 

I now have my network back by having shut down these two C120's . 

I need firmware downgrade file and instructions.   or TPLink need to take this firmware issue seriously and fix it.     See below the Irony that the Deco Security services see the C120 as an intrusion security risk to block....  Come on TPLINK fix this firmware its wrecked many days of my time and its clearly a problem.  I have two cameras I wont connect to my network until I see a fix or downgrade and I'd prefer a downgrade at this time.. please help and instructions. 1.2.1 was a good version.