Strange... is it possible the Bangle has been under water a lot recently? All I can think is the top right is where the (membrane covered) hole for the barometer is, so I guess maybe if somehow water got in there, it could affect the touchscreen.
If so, it may be that just ensuring the Bangle was left somewhere warm to dry out might fix it.
Otherwise I'd make totally sure the touchscreen calibration code is uninstalled unless somehow that's affecting things, but it shouldn't really - apart from that, touch coordinates should be passed straight through.
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Strange... is it possible the Bangle has been under water a lot recently? All I can think is the top right is where the (membrane covered) hole for the barometer is, so I guess maybe if somehow water got in there, it could affect the touchscreen.
If so, it may be that just ensuring the Bangle was left somewhere warm to dry out might fix it.
Otherwise I'd make totally sure the touchscreen calibration code is uninstalled unless somehow that's affecting things, but it shouldn't really - apart from that, touch coordinates should be passed straight through.