Yeah i had a couple of the first 10-60,s ... both failed on large calibres after less than 10 rounds.
I worked with S&B Germany and an issue was identified.. and "Fixed"
All "Current' 6-36,s and 10-60,s are fine..
The issues you describe are exactly what happened to mine ........ Send them back to S&B in Germany and they will "Fix" the issue.
Again...ALL current production are 100% OK .. no issues..
I have since switched from the 6-36,s and 10-60,s to the 5-45,s ( 3 off) ... couldn't be happier~!!