Sporadic loss of performance

Hi guys, I need your help again. The following problem: My motorcycle, Aprilia Tuareg 600, has an extreme loss of power in between. It pats out of the exhaust and has strong false ignitions in the sliding operation and the temperature is also low. I guess it then runs too thin. This only occurs after a longer drive, so when it gets really warm. Increases in slow driving or stop and go where it gets really warm. Suddenly this behaves, ega l whether I give full gas or drive constantly. After different periods of time it has then at once full power again until it comes back after a few minutes. Then it is a constant back and forth. The carburettor has already been completely removed, in the workshop thoroughly cleaned in the ultrasonic bath and resealed. A retrofitted petrol filter made of metal has also been removed again, since we assumed that this becomes too hot and thereby blew in the gasoline formed. However, This behavior still remains. Who can give me tips what I can still look for? Slowly it becomes frustrating greeting