First, start your Mac in "Safe Mode": How to use safe mode on your Mac - Apple Support. Starting in Safe Mode takes longer than usual so let it finish.
While in that mode, drag the following file to the Trash:
PT.updd.plist
Then, restart your Mac normally and confirm the alert messages cease to appear.
Note: Like all non-Apple "anti-virus" products, "Kaspersky" is worthless. You can see for yourself it did nothing to prevent the problematic "ConnectionCachefld" message. Uninstall it according to its instructions. Rule 1 of Macs is don't install junk.