Definitely not just certain models. Spanks, Lesters, it is doing it on as many models as I have tried. I have a Plexiglass Preset on my EleveRack that that I modified to basically a Judas Priest/ Iron Maiden sound. It does not matter what guitar (or model) I run through it, it has heavy sustain and gain. When I do 1/4 note driving rhythm chords steady, you wouldn't notice anything wrong. However, if I hit a chord once and wanted let it go for 2 measures, then nope, not gonna happen. After 4 beats at say 80 BPM, it will go 1 measure, then poof! nothing, it dies out immediately as if someone just pulled the plug. from 100 volume to 0.
My Battery is down to 1 Bar, maybe I'll try charging it and see if it still does it. Also, I'll have to look and see if I can put an older version of firmware on it. This one came with 2.0 already loaded on it. Maybe something going on with a grounding wire possibly too?
But wow, it's almost like Candid camera, like someone's around the corner somehow, turning on the noise gate and clamping it right out after 4 seconds!
ok, I Lied! Its avg 10 beats, not 4. hit a chord once and count 8-10 beats, then its cut off dead, quickly, not a natural decay.