Well. Ios13 was the death of the line6 sonic port in Oct/Nov.
I got wind that 13.4 was going to sort it.
and magically - it did. For a day or two.
The clipping/stuttering was happening before the ios13 debacle though. So I nearly did an excitement wee wee when it worked flawlessly after 13.4.
2 days later...back to shitesville.
Get a neat little riff, want to develop it - spend all time battling clunky tech issues - give up, fume, repeat.