Symptoms:
Continuous alarms 'PSC Service Health Alarm' changed from Green to Red
The alarms keep showing in the vCenter tasks every few minutes.

lwsmd (messages.log)
-------------------------------
2017-10-24T16:33:49.008592+00:00 DPDvCSA lsassd[57593]: 0x7f9aeeffe700:Failed to sync system time [error code: 40075]
2017-10-24T16:33:49.008903+00:00 DPDvCSA systemd[1]: Time has been changed
2017-10-24T16:35:01.839795+00:00 DPDvCSA CROND[20790]: (root) CMD ( /usr/sbin/iiad.sh >/dev/null 2>&1)
2017-10-24T16:36:21.222222+00:00 DPDvCSA cli: twisted "127.0.0.1" - - [24/Oct/2017:16:36:20 +0000] "POST /api HTTP/1.1" 200 2783 "-" "vAPI http client"
2017-10-24T16:44:38.578445+00:00 DPDvCSA systemd[1]: Time has been changed
2017-10-24T16:39:28.000304+00:00 DPDvCSA systemd[1]: Time has been changed
2017-10-24T16:39:28.000753+00:00 DPDvCSA lsassd[57593]: 0x7f9aee7fd700:Failed to sync system time [error code: 40075]
2017-10-24T16:40:01.927556+00:00 DPDvCSA CROND[21980]: (root) CMD ( test -x /usr/sbin/cloudvm_ram_size_periodic && /usr/sbin/cloudvm_ram_size_periodic >/dev/null 2>&1)
2017-10-24T16:40:01.928002+00:00 DPDvCSA CROND[21981]: (root) CMD ( test -x /usr/sbin/vpxd_periodic && /usr/sbin/vpxd_periodic >/dev/null 2>&1)
2017-10-24T16:40:01.932066+00:00 DPDvCSA CROND[21982]: (root) CMD ( /usr/sbin/iiad.sh >/dev/null 2>&1)
2017-10-24T16:40:21.767858+00:00 DPDvCSA cli: twisted "127.0.0.1" - - [24/Oct/2017:16:40:20 +0000] "POST /api HTTP/1.1" 200 2783 "-" "vAPI http client"
2017-10-24T16:40:28.058002+00:00 DPDvCSA netlogond[57580]: 0x7f4229029700: Failed ldap search on 192.168.0.3 error=40290
2017-10-24T16:44:22.307918+00:00 DPDvCSA cli: twisted "127.0.0.1" - - [24/Oct/2017:16:44:21 +0000] "POST /api HTTP/1.1" 200 2783 "-" "vAPI http client"
2017-10-24T16:45:01.033688+00:00 DPDvCSA CROND[23182]: (root) CMD ( /usr/sbin/iiad.sh >/dev/null 2>&1)
2017-10-24T16:51:23.782917+00:00 DPDvCSA systemd[1]: Time has been changed
2017-10-24T16:46:14.000377+00:00 DPDvCSA lsassd[57593]: 0x7f9aeeffe700:Failed to sync system time [error code: 40075]
2017-10-24T16:46:14.000712+00:00 DPDvCSA systemd[1]: Time has been changed
2017-10-24T16:48:23.857432+00:00 DPDvCSA cli: twisted "127.0.0.1" - - [24/Oct/2017:16:48:23 +0000] "POST /api HTTP/1.1" 200 2783 "-" "vAPI http client"
2017-10-24T16:50:01.122551+00:00 DPDvCSA CROND[24420]: (root) CMD ( test -x /usr/sbin/cloudvm_ram_size_periodic && /usr/sbin/cloudvm_ram_size_periodic >/dev/null 2>&1)
2017-10-24T16:50:01.122982+00:00 DPDvCSA CROND[24421]: (root) CMD ( test -x /usr/sbin/vpxd_periodic && /usr/sbin/vpxd_periodic >/dev/null 2>&1)
2017-10-24T16:50:01.124516+00:00 DPDvCSA CROND[24424]: (root) CMD ( /usr/sbin/iiad.sh >/dev/null 2>&1)
2017-10-24T16:52:24.379342+00:00 DPDvCSA cli: twisted "127.0.0.1" - - [24/Oct/2017:16:52:23 +0000] "POST /api HTTP/1.1" 200 2783 "-" "vAPI http client"
2017-10-24T16:58:09.985366+00:00 DPDvCSA systemd[1]: Time has been changed
2017-10-24T16:53:00.000310+00:00 DPDvCSA systemd[1]: Time has been changed
2017-10-24T16:53:00.005540+00:00 DPDvCSA lsassd[57593]: 0x7f9aeeffe700:Failed to sync system time [error code: 40075]

Looking at messages.log there appears to be an issue with the time sync as the time appears to jump 5 minutes back at regular intervals.
We checked the time sync settings. The VCSA is using NTP to sync

VMware vCenter Server Appliance 6.7.x

We changed the VCSA settings to sync time with Host.
Validate the Time Sync between vCenter Server Appliance and the ESXi Hosts in question

The issue also could be due to the Time sync difference between the NTP and the domain time.
Validate the time settings on the Host and the vCSA to sync with the AD.

Synchronize the vCenter Server Appliance Clock with an NTP Server

Synchronize ESXi Clocks with a Network Time Server