Frequent wifi disconnects have occurred since Chrome OS v64 on both beta and stable channels for me as well. These occur spontaneously and I am unaware of what may trigger them. Highly likely to have an automatic disconnect multiple times upon initial startup after a connection is established.

As this issue is related to Chromebooks, marking the OS as Chrome and requesting Chrome team to look into this issue and help in further triaging..

Thanks..

These dropouts are so frustrating -- they're more like a long pause that happen frequently.
We're very concerned thinking about v65 deploying to student/staff Chromebooks!

observation: 

dropouts happening on campus with Ruckus Wireless 300 access points using 2.4G and/or 5G radio connections;

No dropouts with consumer router/WAP (Google OnHub).

model: Acer C720

we are seeing some issues with an acer chromebook 15 cb5-571 user is working along and then the wireless shuts off and acts like it is trying to reconnect. this is on version 64.0.3282.167 I also tried it on ver 65 with the same results. I have powerwashed the system and went under my user id with no change in the result

still seeing issues with this any help on it ?

We are still seeing issues w/ widespred wifi dropping as students are working.  both w/ the beta 65 and 64

still having issues with version 65 in stable channel

we are too.  We moved the beta group w/ 65 to a stable channel but they lose wifi all the time