Hi @Knightrider78. I did an experiment over the weekend to see if I could replicate the same thing with my Buds.
I paired them to an unlocked UK Galaxy J6 on Android 9/One UI.
I put the phone in my jeans front pocket and walked around my room, which also had a laptop on Wi-Fi and a TV & Sky box on, along with another smartphone on. No change in the connectivity.
With the phone still in the pocket I took the jeans off, folded them, put them on a bean bag, piled two large cushions on top – and a leather jacket. (Just for good measure.)
With my Buds on (along with some other trousers on, ‘cos I didn’t want to scare other people) I then walked out of a room that’s known to be a tad troublesome for getting signals in and out – and took my tape measure with me.
I got to around 8 metres before the signal chopped out.
Once safely within that range again, the Buds reconnected.
I repeated all of the above a few times, and in a leather jacket pocket, and also with the Buds paired to an unlocked UK iPhone 4s on iOS 9.3.5.
I got the same results. (The iPhone did marginally better BTW.)
So, looks very much that not all Buds’ signal chops out just by a connected phone being in jeans or a jacket. Even when moving about, or within 8 metres away in another room and with stuff piled on top. If easily broken connectivity is a mass underlying product issue with the Buds then I'm extraordinarily lucky.
But for you and those in the same boat, it's more likely to do with your specific situations (e.g. your specific Buds - or connected phone’s BT - not working as they should be; or there’s some kind of signal interference/conflict going on in the environment you’re in; or related to that, the signal in the Buds/phone for some reason doesn't have as much oomph as needed to overcome local environmental conditions). So, reckon getting your Buds and setup checked out at your nearest Samsung Support Centre is your best course of action so they can determine what's going on in your case. 
