Looks like a cli update of the same Hive OS helps, but is it a fix.
The AP121 sometimes becomes unresponsive when uploading a configuration containing
Workaround: Do not upload AVC signatures to the AP121 and AP141 access points. In addition, upgrading these devices to HiveOS 6.5r3 uploads the latest AVC signatures on the devices.
In a relatively small deployment, the school has 44 APs so far, 20 of which are 121s, I have made the following observations.
Having all AP 121s running HiveOS 6.5r3 Honolulu build2530 will cause 100% CPU on all AP121s even if some have only 1 or two clients connected, e.g. in a remote staffroom scenario.
I then rolled back to the above version and all APs work as one would expected.
Wish at time updates would cause such a hassle.