I had an outdoor gig with my Helix LT last week, firmware 2.51. It was sunny, but we were under a shade cloth, sun peeking through. I couldn't see the LCD screen well at all, a brightness control would be good (a feature I see has been requested). Anyway - before we even started, the unit had been outside for maybe 2 hours, was not hot to the touch, but my output going to a mixer was intermittently failing. I tried 3 different guitar cables, tried re-assigning input to the "Return 1" jack and still failed, so not cable or input jack.... Tried adding an additional output (quarter inch) to another mixer channel and both the XLR and 1/4 inch channels on the mixer failed, so I'm left with the impression that there is an electrical/electronic fault. This has never happened to me before and I practice all the time attached via XLR to a PA speaker and at home use a FRFR connected via 1/4 inch or headphones. The tuner still worked. Has this happened to anyone else? As I said, the sound was intermittent so it just cut in, then cut out again a few seconds later. I eventually re-started the unit and about the 4th time, it worked OK, now I am very nervous about using it at a gig. I can't recreate this in the last few days, but will keep testing