Ominous noise at V70 when driving through holes

Hello dear friends! Last year I asked you which moose you could take, etc. well, at the end of December it became the V70 D5 (BJ 2004) as well. Actually he was a brave little animal so far and did not make a theater. At the moment the tank flap unfortunately does not hold, is somehow completely loose and does not close *shoulder zuck*. But soooo bad I don’t find that, if I close the flap with patch at some point, then it really looks shy ** from … but until then I don’t bother. More uneasiness is caused by the sound of the LANGSAMEN running through e.g. floor waves, or on such a kind of dirt road. There it hits sometimes front, sometimes back, sometimes louder times quieter … everything funny. I can’t describe it more precisely, I have no idea. At the weekend there was also a noise during the VERY FLOTTEN driving through curves – like a grinding. So slowly I get scared. Does anyone know that? Tomorrow he goes to the factory sta tt, but I’d be a little bit more comfortable (or not) if I could locate the thing a little better and better estimate the possible danger. He’s got 91,000 on the clock now and was a brave guy so far. We want to do a longer AB ride on the weekend and there it goes to the thing and you don’t want to do that with a car where you’re afraid it’s going to fly apart (which I just rule out at Volvo).