I have had only a few small glitches, looks like I was pressing controls too fast and unit took extra time to catch up. The only thing I saw recently was when using my NightOwl, the aftermarket cable's plug did not want to seat properly. So when moving around some, right channel would cut out and sometimes the N5ii wouldn't recognize that a phone was plugged in and put the unit in pause mode. I had to adjust then connector by rotating it or pulling it out and re-seating it. Probably just a specific connector as all the others I have used so far did not exhibit this issue. I am reluctant to keep using this plug as I do not want to cause damage to the 3.5 port... No such issue with the 2.5mm port with a balanced cable. This is really a great unit. Love its signature. I still need more time to hear differences between this and the X5iii. I like what I am hearing so far.