Seems the connectivity between your CD servers and the xConnect server was not stablystable. Maybe when a website was running and sending the information to xConnect from which CD servers didn't receive the response in a timely manner.
It doesn't mean the xConnect getting any problems or errors.
If your xConnect is hosted under IIS in a separatedseparate application, you can try to look at its App Pool settingsApp Pool settings. Try to change the "Start Mode"Start Mode
to "AlwaysRunning"AlwaysRunning
and "Idle-timeout Action"Idle-timeout Action
to "Suspend"Suspend
. This can prevent IIS from terminating the xConnect when it reaches the "Idle-timeout"Idle-timeout
(20 minutes as default).