Probe list is not displayed in the right pane when expanding the robot node in the Infrastructure Manager

When selecting the robot in the Admin Console, displays an error:

"Failed to retrieve information for robot at domain/hub/robot" 
" Failed to retrieve information about robot at domain/hub/robot/controller" 

A reboot of nimbus robot watcher service will temporarily fix the issue on this robot, but the same issue could happen on a different robot.

In the hub log, found intermittent errors:

Apr 4 15:53:54:128 [3792] hub: nametoip - /domian/hub/robot xx.xx.xx.xx/50000 - 0 ms (nns) 
... 
Apr 4 15:55:19:383 [1920] hub: nametoip - /domian/hub/robotcontroller not found 
Apr 4 15:55:19:383 [1920] hub: TSESS-P-291783-5 name to IP failed for /domian/hub/robot/controller (not found) 
... 
Apr 4 15:59:01:517 [1052] hub: nametoip - /domian/hub/robot xx.xx.xx.xx/50000 - 0 ms (nns) 
... 
Apr 4 16:00:09:256 [5728] hub: nametoip - /domian/hub/robot/controller not found 
Apr 4 16:00:09:256 [5728] hub: TSESS-P-291878-4 name to IP failed for /domian/hub/robotcontroller (not found) 
... 
Apr 4 16:09:05:264 [3196] hub: nametoip - /domian/hub/robot xx.xx.xx.xx/50000 - 0 ms (nns) 

Release:
Component: UIMHUB

Deploy vs2017_vcredist_x86, vs2017_vcredist_x64 ver 1.01 to the hub robot .

Deploy robot_update 7.97 and hub 7.97 to the hub robot.

Set 'cache_remote_nametoip = no' on hub probe.

Repeat above steps on all hub robots.