Maybe the heavy rain you mentioned got into your display? Like I said, I always have a couple of transparent food bags in my pocket, just in case it rains - I cover the display as soon as... because there's a lot of vibration on a bike, especially mine. Sealing material shrinks with heat and time. Sure the display may be certified to withstand jets of water "From any direction" for a given amount of time, but that's when it's fresh out of the factory, with all it's seals non-shrunk and non-degraded, and not displaced by movement.
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