citrix servers crashing XML error

We have 5 servers running 2008 R2 with xenapp 6.5 we also have a separate server running 2008 R2 with citrix web interface management all are running in a virtual environment. About once every two weeks we have experience this issue. Users will start to disconnect and they will get an error from there receiver stating "citrix receiver cant contact the server". When this happens I will try to logon directly to the servers and sometimes its only 1 server that is "broke" but I have seen up to 3. When I try to logon to a server that is "broken" it wont come up with the fields to put my username and password into when I ctrl+alt+del (actually insert). I have to kill power to the citrix server and bring it back up and that fixes the issue. I do get windows log errors on the citrix web management server. The error is below

Log Name:      Application
Source:        XenApp Services
Date:          4/21/2016 6:58:54 AM
Event ID:      30001
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      CTXWeb.domain.com
Description:
Site path: C:\inetpub\wwwroot\Citrix\PNAgent.

An error occurred while attempting to read information from the Citrix servers: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 10.1.250.6:80. This message was reported from the XML Service at address http://servername.com/scripts/wpnbr.dll [com.citrix.xml.NFuseProtocol.RequestAppData]. The specified Citrix XML Service could not be contacted and has been temporarily removed from the list of active services. [Unique Log ID: ecdad577]

For specific information about this message, see the Web Interface documentation at http://support.citrix.com/proddocs/topic/web-interface-impington/wi-log-messages-event-ids-hardwick.html.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="XenApp Services" />
    <EventID Qualifiers="0">30001</EventID>
    <Level>2</Level>
    <Task>0</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2016-04-21T11:58:54.000000000Z" />
    <EventRecordID>96005</EventRecordID>
    <Channel>Application</Channel>
    <Computer>CTXWeb.domain.com</Computer>
    <Security />
  </System>
  <EventData>
    <Data>Site path: C:\inetpub\wwwroot\Citrix\PNAgent.

An error occurred while attempting to read information from the Citrix servers: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 10.1.250.6:80. This message was reported from the XML Service at address http://servername.com/scripts/wpnbr.dll [com.citrix.xml.NFuseProtocol.RequestAppData]. The specified Citrix XML Service could not be contacted and has been temporarily removed from the list of active services. [Unique Log ID: ecdad577]

For specific information about this message, see the Web Interface documentation at http://support.citrix.com/proddocs/topic/web-interface-impington/wi-log-messages-event-ids-hardwick.html.</Data>
  </EventData>
</Event>