I recently purchased the Helix LT and I have been enjoying it both for playing at home, and for party gigs.
I realised that I can practise in my room by connecting it through the USB, and play through my jbl LSR305 monitors, which really sounds great, and also gives convenient parameter control through the HX edit software.
A recurring error is however stifling my enthusiasm. When I've been playing for say 5-10 minutes, the Helix freezes and becomes unresponsive. I