I have been using Garmin Bike Computers for years, I bike 5-6 days a week, so use them a lot. Pretty much all of them have worked well. My Edge 1000 recently died, so I purchased a 520 as a stopgap till my 1030 arrived today. 520 worked fine, even though no touch screen and pretty basic. First workout today with the 1030. Awful. Had to start and stop the workout 4 times, and then the hard efforts were not done properly because I could not see the data I needed on the screen.
Screens would switch at random to all sorts of different screens, not just data screens. No pattern. Might work well for 5 minutes, then go berserk.
I disabled phone alerts, then deleted any other data screens in the activity, then disabled weather, These things should work.
I'm not sure if I have a lemon or some setting or interference is causing these issues. I use a TACX FLUX trainer. Initially, I had added the trainer, but then thought it might be causing problems so just added it as sensors, i.e. power, speed/distance and cadence.
Touch screen does not work at all now. Can't even shut it down properly. Not happy at all.