if you haven't then I'd consider replacing the water pump as they can start slipping of the water pump impeller on its shaft
Also its possible the belt is slipping so its worth replacing its especially if the rubber ribs are cracked or it looks shiny on flat side of the belt - while its off check that the tensioner and other pulleys all spin freely the exception to this is the AC pump ( if fitted)
I'd also suggest ensuring that you've got all the air out of the system as thissort of episode can leave pockets of air trapped and prevent the coolant from circulating properly.
Socheck that the small hoses that run from the top of the engine and radiator thatrun back to the header / expansion tank are free flowing and not blocked
Ifthese are OK then remove the tank pressure cap and run the engine from cold with the heater set to full hot
As the engine starts to warm, squeeze the large hoses running to the radiator to help displace any air - all the time keeping an eye on the level in the header tank,making sure it doesn't drop below the minimum and open any bleed screws builtinto the top cooling hoses - closing them off as soon as they start to gush water
Oncethe engine is up to temperature the tank should be quite full. Switch theengine off and leave it to cool
Thentop up to the mark once its all cold and replace the cap