Stupid beating from the front…

Moin moin, so for a change I have a little problem… Was for a while nothing more and now it became time again… At extremely warm temperatures from 27 degrees or when the car stood long in the sun etc., I have a dull blow from the engine room. As if you have a loose exhaust and with every small floor shaft the exhaust is hit. Strangely only after the repair it was bomb-proof again. It does not move and in the Kardan tunnel where the exhaust goes long is also n It is also not to be heard at speeds from 60km/h and strong waves of the ground. Much more in the slowly viscous traffic and even with mirror-smooth road (asphalt) a stick on the road is enough to shake the car and this beating is to be heard. So loud that it is already animally annoying. Does anyone know this perhaps??? I would also like to say that it comes from the middle of the car. Therefore, I close the direct suspension of the chassis (coupling rods). etc.). Is it perhaps the lower engine bearing??? Greetings pseudo R