Hyper-V hosts stop polling until manually hitting 'poll now' link

Look for if the Nextpoll date is in the past. That's a scheduler bug if so, and probably a sign of some other poor health in the environment

Also worth checking if the performance poll is set to a stupidly long duration (4 hours or so) as that seems to be common

The Nextpoll date seems to be fine. We have had this issue crop up on yet another server, so it continues despite our best efforts. 

I'm not sure what you are referring to in terms of 'performance poll'. That isn't a setting I'm familiar with; can you elaborate?

The Nextpoll date seems to be fine. We have had this issue crop up on yet another server, so it continues despite our best efforts. 

I'm not sure what you are referring to in terms of 'performance poll'. That isn't a setting I'm familiar with; can you elaborate?

There's a Status poll, a performance poll, and a topology poll - For whether you're trying to find out What's UP, what's hot, or what's where. The performance poll actually does most of the stuff you care about for virtualization (usually i've not got much hyperV in my env at the moment)

Check these places:

Table: SELECT TOP 1000 VCenterID, HostID, NodeID, PollingTaskTypeID, PollingInterval, JobTimeout, APITimeout, LastPoll, LastPollStatus, LastPollStatusMessage FROM Orion.VIM.PollingTasks

Look for large numbers and if there's an error. A long topology poll is OK, a long stats/status poll is not

Perfstack: Select like 5 days or something. Add the metric you care about, as you move your cursor over the timeline if it doesnt update position regularly you're not getting much data checked

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Check everything with Poll and a number.

I think there's another good place to look, but worth a shot, been a while.