This KB explains the issue of continous reboot of EX2300 Switch platform and lists down possible solution to mitigate the issue.

After reboot switch comes back and then again reboots with below errors :-

login: 
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 21 27 e8 00 00 40 00
(da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0): Retrying command
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 21 27 e8 00 00 40 00
(da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0): Retrying command
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 21 27 e8 00 00 40 00
(da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0): Retrying command
c.c.(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 21 27 e8 00 00 40 00
(da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0): Retrying command
(da0:umass-sim0:0:0:0): READ(10). CDB: 28 00 00 21 27 e8 00 00 40 00
(da0:umass-sim0:0:0:0): CAM status: CCB request completed with an error
(da0:umass-sim0:0:0:0): Error 5, Retries exhausted
g_vfs_done():gpt/junos[WRITE(offset=739377152, length=20480)]error = 5
g_vfs_done():gpt/junos[WRITE(offset=739409920, length=32768)]error = 5
g_vfs_done():gpt/junos[WRITE(offset=739639296, length=32768)]error = 5
g_vfs_done():gpt/junos[WRITE(offset=739672064, length=32768)]error = 5
g_vfs_done():gpt/junos[WRITE(offset=739704832, length=32768)]error = 5
g_vfs_done():gpt/junos[WRITE(offset=751042560, length=4096)]error = 5
g_vfs_done():gpt/junos[WRITE(offset=790777856, length=4096)]error = 5

This issue of continous reboot can be both transient and permanent failure on the device.
Logs as listed in symptom section  are related to error seen on hard disk ,which causes the switch to reboot.

If the reboot is unable to fix the errors,the device might continue to reboot.

This can be a transient issue related to hard disk so format installing the device might help to resolve the issue.
Below KB can be followed to format install the device

https://supportportal.juniper.net/s/article/EX-How-to-format-install-EX2300s-and-EX3400s-via-USB

Note :- Format install will remove the configuration from the device so please ensure configuration backup if available on external server is available for quickly adding to device post format install is complete.

In case format installing the switch doesnot resolves the issue please contact JTAC support for further assistance.