Fiat Punto 188 (BJ 2005) Noise on the axle, wheel nuts hot

Hello, I have a problem with my Punto. For some time I have had a metallic grinding from the front axle during the ride (side rather difficult to detect acoustically, tending on both sides). In addition, even after short rides the wheel nuts become extremely hot. The grinding usually only stops after a short time (if necessary because something has to warm up and then expands?) and is dependent on steering movements and the brake. he brake kicke stops it for the moment and sets up shortly afterwards again. Yesterday I drove about 15 km highway and had to steer/brake rather little and after that the wheel nuts were not very warm. After that 15km country road and city and the grinding has inserted and the wheel nuts were warm. Therefore the first guess: brake / brake caliper clamps. What I did: everything apart and looked at the blocks. Tragbild looked actually inconspicuous. Oetze cleaned and lubricated with copper paste. Guide bolts of the caliper examined: also here inconspicuous and smooth. Nevertheless, newly greased. When the tire is down, the wheel can also be rotated by hand and does not sit totally tight. The brake piston can be pushed back by hand. Challenges some effort but it works. This means for me that it can not come directly from the brake. My next guess is for this reason: wheel bearing defective. Hierb I’m a little skeptical, however, because the noise is very high frequency and metallic. Besides, it usually doesn’t occur directly at the start of the ride but only after a short time. However, steering movements influence the noise. Can a defective wheel bearing lead to an imbalance or similar of the brake discs, so that it grinds here? What is your opinion about this? Greetings Addendum: Brakes were made completely about half a year ago. Don’t know exactly how many KM there are now, but discs and KMs. Lots look good.