Based on your further data I would suspect you have an issue with the connectivity to these Aerohive physical link and not an RSTP issue.
The traps show the link going down. You can check the port statistics since clearing or reboot.
show interfaces ge-0/0/7 extensive | match "error|flap|carrier"
Flaps and carrier transitions are indications of losing the layer 1 link on the port. And this may be your issue.
See if the port is coming up full duplex and remove auto-neg and set specific speeds as needed for the device.
show interfaces ge-0/0/7 media
Also test and confirm the cables are all good.