I've had the 'dropouts' consistently too. I don't know if it's noticeable to those listening but I definitely feel it when playing. However, it only catches my attention when playing at home, with the band playing i don't notice it.
However....... I surprised myself at how much I committed to using it live. I've never been a believer in the benefits of playing in stereo with a band, so didn't expect me to adopt it so thoroughly. It sounds marvellous through IEMs but at band practices, we often just plug the bass, vocals and Kemper into the PA at the rehearsal space. The cabs are widely spread and the DT sounds really good alone but when the bands gets excited, the guitar loses clarity and punch and disappears. Everyone in the band agrees.
We're a 3 piece rock band, a little energetic and hard edged and I'd persuaded myself that the double tracker would make us sound bigger live, even when all my previous experiences suggested otherwise.
Tonight, I've removed the double tracker from all my performances. It's a great feature and through no fault of its own it takes far more than it gives.
Happily back with mono guitar with the odd stereo delay for fun.