MS60/MR60 Constant Dropping - used to work fine

Hi, why is it that you can't make a stable firmware for these routers and satellites? I have had this configuration for quite some time but in some update not too long ago it suddenly started becoming very unusable. This is very bad for working from home and being on video conferences with clients. It's completely unacceptable. It appears to be a form of "planned obsolescence" which you have baked in to get people to upgrade to the latest thing - which will then become unstable. I never had this problem with linksys, ASUS or TP Link.

Setup:

MR60 

Two MS60 satellites (one hard wired ; one wifi only)

3400 sq feet.

All V1.1.7.134

Used single router for years with no issues. Now with the "mesh" system it has become more of a mess than a mesh.

Please advise and no hokey "reboot" or "update firmware" ropadope.