We are seeing this error message in SL Errors, which is the final line in the log before the agent automatically restarts we see the vip then changes back to the offline config and once DataMiner restarts it changes back to the active vip.
The question is why is this happening, and if it is anyway related to this log line here (note we do not see this file on multiple of the failover agents and these agents are not restarting)
SLFailover.txt|SLFailover|12976|8112|CHardware::InitializeIP|ERR|0|Not executing script C:\Skyline DataMiner\Tools\VIPReleased.ps1 -- File not found
I believe that to answer your question we will need to do a deeper investigation that will require the Log Collector package from both agents and the time it happened.
I suggest sending the question to email@example.com and take a LogCollector package from each agent (Collecting data to report an issue to Technical Support | DataMiner Docs), also the time it happened.