After my TZT3's have been powered on for a long time, the touchscreens get wonky. One of the things I have seen a few times is that it will respond normally to a single finger but two finger operations like pinch to zoom don't work at all.
I have not determined the exact sequence of events that causes it, but whenever it has happened it has been after I've been fishing for 6+ hours. It has happened to both of the screens but not at the same time. Once it starts, it doesn't fix itself until the next time I use the boat--I have not tried power cycling the unit when it happens which would probably be a good idea but I'm trying to fish, not play beta tester.
I have not determined the exact sequence of events that causes it, but whenever it has happened it has been after I've been fishing for 6+ hours. It has happened to both of the screens but not at the same time. Once it starts, it doesn't fix itself until the next time I use the boat--I have not tried power cycling the unit when it happens which would probably be a good idea but I'm trying to fish, not play beta tester.