XML Parse error

Hi

I have started getting an error from both Mac and iPhone clients

This when Mac client connects

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   Indigo Cocoa client authenticated (192.168.0.40)
   Error (client)                  XML Parse Error: mismatched tag
   Error (client)                  In server packet stream
   Error (client)                  On character 3482039 of line number 1.
   Error (client)                  XML Parse Error: not well-formed (invalid token)
   Error (client)                  In server packet stream
   Error (client)                  On character 28826 of line number 1.
   Error (client)                  XML Parse Error: not well-formed (invalid token)
   Error (client)                  In server packet stream
   Error (client)                  On character 19878 of line number 1.
   Error (client)                  timeout waiting for server response for request GetPluginList

Then more like this ongoing.

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   Error (client)                  XML Parse Error: not well-formed (invalid token)
   Error (client)                  In server packet stream
   Error (client)                  On character 19899 of line number 1.

3 Oct 2023 at 09:26:23
   Online Sensor                   'Online PiHole Dining TRV' on
   TP-Link Devices                 StopPoll max exceeded (). using 1000000000
   Trigger                         Shelly Overwrite Temp Study
   Action Group                    Shelly Overwrite from Sensor Study
   Error (client)                  XML Parse Error: not well-formed (invalid token)
   Error (client)                  In server packet stream
   Error (client)                  On character 19893 of line number 1.
   Error (client)                  XML Parse Error: not well-formed (invalid token)
   Error (client)                  In server packet stream
   Error (client)                  On character 19881 of line number 1.
   Error (client)                  XML Parse Error: mismatched tag
   Error (client)                  In server packet stream
   Error (client)                  On character 20230 of line number 1.

Any ideas? I have recently changed broadband (although above is connecting locally) and enabled jumbo frames on both Unifi router & Switches and the Mac Server and Mac Client. Could this be related?

I think this was due to turning on jumbo frames of 9000 on the intel mac mini. Despite being enabled on all the unifi switches and router it was not holding a stble connection. Not sure why but was also impacting remote desktop from another Mac, that after I had unlocked the remote server (my mini) it would then lock again a few seconds later as the ethernet connection got dropped and reconneted.

Weirdly it also resulted in >10,000 phantom mac addresses on my Unifi controller coming from the mini's port, which was very strange.