Wahoo great customer service
I had a similar experience - had a Bolt that I didn't cover in the rain and it got wet. I think I made it worse by pressing the page and other buttons wet. Got screen and other malfunctions. I told the tale to Wahoo and they sent me another right away. The replacement has worked fine for over a year.
Another comment on the customer service- I was worried that the little blue rubber usb cover would fail or be torn off. I did email customer service to find out if I could buy one to have on hand but they wanted me to send my unit in. That wasn't necessary. Customer service followed up with several emails requesting me to follow through... Shows they really want to resolve any issues...good for them