PVS targets do not reconnect during HA failover
This was narrowed down to only occuring when target devices vdisks have installed Palo Alto terminal services agent

Recommendation from Palo Alto support which resolved the issue:

1. In private mode, install version 10.0.1.32 of the Palo Alto agent
2. Then configure registry settings on the vdisk

[HKEY_LOCAL_MACHINE\SOFTWARE\Palo Alto Networks\TS Agent\Adv]
"EnableDetachFilter"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PANTAD]
"EnablePVSDriver"=dword:00000001