so, i did this a couple of times, but it didnt fix the problem. though it did cause about 20 zwave devices to go offline, but they came back online after a little while.
it appears that its time to change/divide devices across multiple hubs. this is a v2 hub 200 from around '15 and the second time its done this type of zwave behavior. same as last time around 300 devices during firmware updates.
so, i have access to various v2 200/250 v3/aeotec hubs. i was thinking about spreading out the 300 devices across multiple hubs. say put the water leak sensors and smoke alarm detectors on one hub. motion detectors on another hub. contacts on a different hub. outside mailbox, yard motion sensors, gate contacts on their own hub. this way it would balance out the load and then something goes rogue hopefully it would be less to reset at a time.
something else to keep in mind is where samsung is going with smartthings and their own sensors vs. other brand sensors. might need to put all the smartthings sensors on their own hub eventually.