I have had good luck with the latest .135 release.
That said, I have my hub set to purge to 15 events per attribute (vs 100 default).
you can change this if you like on your hub, I think the endpoint is:
http://hup-ip/hub/advanced/event/limit (to see limit)
http://hub-ip/hub/advanced/event/limit/15 (to set it to 15).
If you change it, you likely want to:
http://hup-ip/hub/cleanupDatabase
wait a few mins, then reboot your hub (he console -> settings -> reboot)
I expect what may be happening
-
purging the db makes the DB smaller (and it uses less memory)
- if you follow procedure to cleanup, wait a few mins, then reboot
-
the latest version of firmware further tries to improve performance by caching some DB in memory (uses more memory).
If you run really low on memory - you get hang, un-responsive, etc.
Just my theory (and some of my experience running C4, C5, and C7 hubs)