I think I have more of an issue with a specific filament rather than the nozzle. I did the first couple of prints with Bambu PLA matte gray and then I wanted to try out the AMS and print a small keyring which has white writing on it. I had several failed attempts because as soon as it came to the white filament it would rip up and clump on the nozzle and generally misbehave. The blue sections printed fine but white was always a pain. It eventually blocked the nozzle.
I switched to the 0.4 and I found I was still getting issues with the white. I dried it for 8 hours and tried again and it’s still the same. I eventually tried increasing the nozzle temp slightly and NOW it prints fine. No idea why the white is such a pain compared to the 6 other colours I use but now I know. I’ll still have to unclog my 0.2 though.