are you sure you even know how to use the phones? there are so many new features and so much that works a bit different that it is a good possibility that there is nothing wrong with the phone, especially since you are claiming the same glitches happened to two different model phones.
I purchased my 512gb Note 10 plus this past Saturday from Verizon. I was so excited only to experience the same glitches I have been experiencing with my S10 Plus. After spending several hours speaking with Samsung customer support I had to send the S10 plus back to Samsung and now my new Note 10 plus is so glitchy that I can't even use the provided headset because the phone glitches and the phone volume keeps turning itself off. I was told it was a safety feature and worked with Samsung customer support to utilized advance features. In addition the phone was rebooted and nothing has worked and Samsung technical support told me that a new software patch was coming with no ETA in sight! Instead of me waiting for that I am taking the phone back to Verizon since its still within the return period. My new S10 plus was mailed to service today to Samsung hoping those glitches could be fixed. Two expensive flagship phones that don't work as intended. I am so done with Samsung. If you cannot use the headset to make a call or listen to music without the phone glitching I don't know what to tell you Samsung! You lost a loyal customer!