MK7 GTI engine overheating...

So I just got this GTI in February and it never got the waterpump and thermostat housing replaced so I had the typical epc light and engine light. I got the replacement for both and were good until a few weeks passed. Same issue happened again so I started to trouble shoot from yt and other outlets. I changed the ignition coils and sparkplugs to start somewhere, and then someone check for leaks and seen nothing so everything seemed good. Its been a month now and the other day my thermostat goes to 243F and got the same code for coolant flow low. I'm losing my mind slowly and don't know what to do, is there any help someone can provide me on what I should have checked because at this point I don't understand what is happening and how every few weeks its having the same problem...(2016 GTI S with 91500 miles)