I haven’t had any dropped devices since last October (see above thread). Occasionally I am running into ‘stuck’ devices when I reboot my hub. However, I noticed that they get stuck and require power cycling when the device changes state while the hub is rebooting so I only reboot the hub when I am alone in the house and I am not walking around for 30 minutes. This practice has reduced (if not eliminated) the stuck state. Maybe is pure superstition, but it has worked for me for 6 months.
@JDRoberts the absence of issue with my devices doesn’t negate your problems. I’ve been there. Could it be that the issues people have is regional only on specific servers?