cluster failover

I have an Exchange cluster that likes to switch over ever other day. It does not matter on time of day or time of week. It all starts with a 1135 Event ID and then is followed by 1562 and 1069 and 1564 and 1177.

We have servers in two different states.

The event ID says the cluster service may have stopped or lost communication with other active nodes. I've added to the nic team for communication.

The log on the near server says the far server has lost communication and the log on the far server says the near server has lost communication at the same time.
 
The switch is not reporting any problems. I'm not getting any reported problems with the nics either.

We've recently upped the samesubnetdelay and crosssubnetdelay.

There was one new program installed but that has since been uninstalled.

The only other things that have happened since the time when all is well to now is just windows updates.

Any help would be greatly appreciated.  Thank you
mfonyAsked:
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Miguel Angel Perez MuñozConnect With a Mentor Commented:
Messages about lost of connectivity between clusters, like link down or overload on links causes traffic lost and cluster switchover.
Could you ensure link between nodes are running ok when cluster switch over?
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Miguel Angel Perez MuñozCommented:
Could you check Cluster.log logfile and paste entries when cluster switch over?
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mfonyAuthor Commented:
on the first critical 1135 message:

[RES] Network Name: Agent: Sending request Netname/RecheckConfig to NN:463e84f0-5b46-4e78-ac45-e20054b0a8a4:Netbios
[RES] Network Name <Cluster Name>: Netbios: Slow Operation, FinishWithReply: 0
[RES] Network Name:  [NN] got sync reply: 0
[RES] Network Name <Cluster Name>: Netbios: End of Slow Operation, state: Initialized/Idle, prevWorkState: Idle

I looked through the file and most if not all of the  lines had

FinishWithReply:0
Netbios:Slow Operation
Dns:Slow Operation
got sync reply:0
prevWorkState:Idle

The other types of lines included:

[GEM] Sending 1 messages as a batched GEM message
[GUM] Node 2: Processing RequestLock 2:7932
[GUM] Node 2: Processing GrantLock to 2 (sent by 1 gumid: 2835855)
[GEM] Sending 1 messages as a batched GEM message

I don't see anything happening in this file. What am I looking for?
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