I tried the above suggestions and rebooting. Looks like there is something intrinsically wrong with the device, or I could be wrong. This is what I saw in the messages log:
Feb 1 02:05:10 srx240b snmpd[1145]: SNMPD_TRAP_COLD_START: trap_generate_cold: SNMP trap: cold start
Feb 1 02:05:18 srx240b init: web-management (PID 1171) terminated by signal number 11. Core dumped!
Feb 1 02:05:18 srx240b init: web-management (PID 1190) started
Feb 1 02:05:25 srx240b init: web-management (PID 1190) terminated by signal number 11. Core dumped!
Feb 1 02:05:25 srx240b init: web-management (PID 1202) started
Feb 1 02:05:26 srx240b init: l2cpd-service (PID 1160) exited with status=0 Normal Exit
Feb 1 02:05:26 srx240b init: l2cpd-service (PID 1208) started
Feb 1 02:05:32 srx240b init: l2cpd-service (PID 1208) exited with status=0 Normal Exit
Feb 1 02:05:32 srx240b init: l2cpd-service (PID 1241) started
Feb 1 02:05:32 srx240b init: web-management (PID 1202) terminated by signal number 11. Core dumped!
Feb 1 02:05:32 srx240b init: web-management (PID 1243) started
Feb 1 02:05:39 srx240b init: l2cpd-service (PID 1241) exited with status=0 Normal Exit
Feb 1 02:05:39 srx240b init: l2cpd-service (PID 1273) started
Feb 1 02:05:40 srx240b init: web-management (PID 1243) terminated by signal number 11. Core dumped!
Feb 1 02:05:40 srx240b init: web-management is thrashing, not restarted
Feb 1 02:05:44 srx240b init: l2cpd-service (PID 1273) exited with status=0 Normal Exit
Feb 1 02:05:44 srx240b init: l2cpd-service is thrashing, not restarted
Feb 1 02:05:46 srx240b alarmd[1142]: syslog: unknown facility/priority: ff04
Feb 1 02:05:55 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:05:58 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:05:58 srx240b init: l2cpd-service (PID 1368) started
Feb 1 02:05:58 srx240b init: can not access /usr/sbin/hostname-cached: No such file or directory
Feb 1 02:05:58 srx240b init: hostname-caching-process (PID 0) started
Feb 1 02:05:58 srx240b init: web-management (PID 1370) started
Feb 1 02:05:58 srx240b init: can not access /usr/sbin/ipmid: No such file or directory
Feb 1 02:05:58 srx240b init: ipmi (PID 0) started
Feb 1 02:06:00 srx240b /kernel: GENCFG: op 2 (USP Blob) failed; err 7 (Doesn't Exist)
Feb 1 02:06:00 srx240b /kernel: GENCFG: op 2 (USP Blob) failed; err 7 (Doesn't Exist)
Feb 1 02:06:03 srx240b init: l2cpd-service (PID 1368) exited with status=0 Normal Exit
Feb 1 02:06:03 srx240b init: l2cpd-service is thrashing, not restarted
Feb 1 02:06:04 srx240b init: web-management (PID 1370) terminated by signal number 11. Core dumped!
Feb 1 02:06:04 srx240b init: web-management is thrashing, not restarted
Feb 1 02:06:09 srx240b /kernel: GENCFG: op 2 (USP Blob) failed; err 7 (Doesn't Exist)
Feb 1 02:06:35 srx240b srx240b SCHED: Thread 40 (FWDD CM) ran for 1677 ms without yielding
Feb 1 02:06:35 srx240b srx240b Scheduler Oinker
Feb 1 02:06:35 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:36 srx240b last message repeated 2 times
Feb 1 02:06:36 srx240b srx240b Frame 00: sp = 0x508da5a8, pc = 0x08028cd0
Feb 1 02:06:37 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:37 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:37 srx240b srx240b Frame 01: sp = 0x508da650, pc = 0x080139d0
Feb 1 02:06:37 srx240b srx240b Frame 02: sp = 0x508da6c0, pc = 0x080151a4
Feb 1 02:06:37 srx240b srx240b Frame 03: sp = 0x508da6e0, pc = 0x081c3be4
Feb 1 02:06:37 srx240b srx240b Frame 04: sp = 0x508da700, pc = 0x081c4080
Feb 1 02:06:37 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:37 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:38 srx240b srx240b Frame 05: sp = 0x508da750, pc = 0x08028528
Feb 1 02:06:38 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:38 srx240b srx240b Frame 06: sp = 0x508da778, pc = 0x00014000
Feb 1 02:06:38 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:39 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:39 srx240b srx240b SCHED: Thread 74 (PFE Manager) ran for 3128 ms without yielding
Feb 1 02:06:39 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:40 srx240b srx240b Scheduler Oinker
Feb 1 02:06:40 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:40 srx240b srx240b Frame 00: sp = 0x50b07798, pc = 0x08028cd0
Feb 1 02:06:40 srx240b /kernel: STP: STP IPC op 1 (ForwardingState) failed, err 1 (Unknown)
Feb 1 02:06:40 srx240b last message repeated 2 times
Feb 1 02:06:41 srx240b srx240b Frame 01: sp = 0x50b07840, pc = 0x080139d0
Feb 1 02:06:41 srx240b srx240b Frame 02: sp = 0x50b078b0, pc = 0x080196d0
Feb 1 02:06:41 srx240b srx240b Frame 03: sp = 0x50b078e8, pc = 0x080107a0
Feb 1 02:06:41 srx240b srx240b Frame 04: sp = 0x50b07918, pc = 0x08e65ba0
Feb 1 02:06:41 srx240b srx240b Frame 05: sp = 0x50b07950, pc = 0x08e4d5b8
Feb 1 02:06:41 srx240b srx240b Frame 06: sp = 0x50b07a00, pc = 0x08e4d9d0
Feb 1 02:06:41 srx240b srx240b Frame 07: sp = 0x50b07a40, pc = 0x08e4db18
Feb 1 02:06:41 srx240b srx240b Frame 08: sp = 0x50b07a60, pc = 0x08b9dd60