Just had mine lock up mid-tweak (not the one I sent in before).
Was adjusting the Drive 1's Tone parameter -- quickly rolling from 10 to zero, but it stopped at 9.57 (about two or three seconds), the screen blinked (all blank (still lit) and then back to the regular display, off-on was about one second) and I couldn't adjust anything after that.
Drive type was on Pi Fuzz, Drive was not quite zero (either 0.16 or 0.20, according to the graphic), Level was default, Mix was 100%. Not sure on the Page 2 params, but I think they were default.
I'd been editing the drive and tone (including fairly rapid adjustments) for probably ten minutes before the lockup, and was playing through it.
No modifiers attached.
I don't believe I ever used either Editor on this patch.
I think I had the Drive block on row 2, column 2. Other blocks in the chain include Amp, Cab, Reverb, and shunts, and I think I have adjusted the main Noise Gate from the default parameters. CPU usage on the patch is about 48%.
The unit had been on for about a week -- started playing through it today about half an hour before the lockup.
As with the others on this thread, a simple reboot restored all functionality.
Can't seem to duplicate it yet.