Hello, I need help. My Bambu Lab A1 AMS is making many stops to purge after switching to the second filament, it prints normally but after switching to another filament it prints for 10 seconds or so and then stops and starts a filament purge process, the screen shows "heating" and then "purge old filament", after throwing the filament away it returns to printing for another 10 Pu seconds and stops to purge again and continues in this cycle throughout the print.